feat(db)!: port DataAccess to the Notes integer schema

Notes.RootBlogName/NoteBlogName/Type became RootBlogId/NoteBlogId/TypeId
on 2026-08-07, resolved through the new BlogNames and NoteTypes tables.
There is no compatibility view, so every affected statement is a hard cut.

All 14 call sites in DataAccess.cs are ported:

- Notes->Blogs joins go through Blogs.BlogId in one integer hop; the
  Notes->Posts join in GetRepliesWithFilledText is the only one that must
  route through BlogNames, since Posts carries no BlogId
- AddNote registers both blog names and the note type with INSERT OR
  IGNORE before inserting, in one transaction committed before the console
  sleep. Registering the type matters: an unseen type would resolve to
  NULL and fail NOT NULL on TypeId, silently losing the note
- The LEFT JOIN Notes in GetPosts is dropped rather than translated. It
  selected nothing, could not remove a row, and its duplicates were
  collapsed by the query's own GROUP BY
- Duplicate-key detection moves to IsNotesDuplicateKey, matching the
  constraint and table instead of an exact column list. The old literal
  string is what broke on this rename
- EnsureReplyTextColumnExists drops DEFAULT '.', matching the migrated
  schema: new rows get NULL, not a placeholder nobody wrote

verify-db-schema.sql gains BlogNames, NoteTypes, Blogs.BlogId and the new
Notes columns, plus query 1d naming a pre-migration file and pointing at
normalize-notes.sql. Blogs.BlogId is deliberately not auto-fixable -- an
added-but-empty column makes engagement joins return zero rows silently.

Verified against the live 148 MB file: query plans hit the intended
indexes, and the BlogId join matches an independent name-resolved
formulation exactly on all 4,267 GetBlogs and 2,637 GetBlogsForLikes rows.

RolodexRepository.cs (16 sites) lives in the Rolodex repo and is not
covered here.

Co-Authored-By: Claude Opus 5 <[email protected]>

.github/copilot-instructions.md

@@ -22,18 +22,18 @@ This document provides essential context for AI agents working with URLNotesGrab
 ```powershell
 dotnet build
 dotnet run            # Process all files in input directory
-dotnet run -- -parse [blogname]  # Process specific blog
-dotnet run -- -test [blogname] [postID]  # Test API for specific post
+dotnet run -- --parse [blogname]  # Process specific blog
+dotnet run -- --test [blogname] [postID]  # Test API for specific post
 ```
 
 ### Command-Line Interface
-- `-parse [blogname]`: Parse text files for specific blog
-- `-test [blogname] [postID]`: Test API note collection
-- `-posts`: Export post blogs to file
-- `-blogs`: Export blog list to file
-- `-collect`: Collect notes for all posts in DB
-- `-blogsR`: Export reply blogs to file
-- `-blogsO [start] [stop]`: Export blogs within range
+- `--parse [blogname]`: Parse text files for specific blog
+- `--test [blogname] [postID]`: Test API note collection
+- `--posts`: Export post blogs to file
+- `--blogs`: Export blog list to file
+- `--collect`: Collect notes for all posts in DB
+- `--blogsR`: Export reply blogs to file
+- `--blogsO [start] [stop]`: Export blogs within range
 
 ## Project Conventions
 

AGENTS.md

@@ -11,6 +11,7 @@
 - `ResponseNotes.cs`: Tumblr API response models
 - Round-robin API key rotation with rate-limit tracking
 - Automatic console color assignment per API key for output differentiation
+- No-argument mode (`Program.TraverseDirectory`) ingests `.txt` blog export files into `Posts` via `DataAccess.AddPost`. Recognized field prefixes live in `TraverseDirectoryFieldPrefixes`; `Body:` and `Downloaded files:` collect every following line up to the next recognized prefix (multi-line values). `RootURL` is populated from a `Reblog root url:` line the same way it's populated from the API-based `--likes` flow — both paths converge on `DataAccess.AddPost`'s `rootURL` parameter, which `UpdatePost` only overwrites when the incoming value is non-empty (existing `RootURL` is preserved otherwise)
 
 ## Developer Guidelines
 
@@ -27,6 +28,162 @@
 - Preserve console color state: use save/restore pattern for temporary color changes
 - API rate limits must use `ApiKeyPool.MarkRateLimited()`/`MarkAvailable()`
 
+### API Failure Classification
+Tumblr sits behind a CDN that returns HTML error pages (403, 5xx) which never reach the API. These
+say nothing about the item being fetched, so they must not be recorded as per-item failures.
+
+- A response body that will not parse as JSON did not come from the API. Flag it with
+  `Root.transientFailure`, never as `FAILURE`
+- Transient failures retry in place (`TransientBackoffSeconds`) before the item is skipped; a skipped
+  item stays unmarked in the DB so a later launch retries it
+- `MaxConsecutiveTransient` consecutive transient failures aborts the pass rather than skipping
+  item-by-item against an edge that is refusing all traffic
+- Only call `ApiKeyPool.MarkAvailable()` on a response that actually reached the API. A transport or
+  CDN failure says nothing about the key's standing and must not clear its flag
+- Only a real HTTP 429 (or `meta.status == 429`) counts as a rate limit. Do not infer one from the
+  presence of `X-RateLimit-*` headers, which Tumblr sends on every response
+- Rate limiters must pace with `await AcquireAsync()`. `AttemptAcquire()` does not wait, so a
+  saturated window aborts the run instead of throttling it
+- Long-running commands return exit 3 when a pass ends incomplete (rate-limit pause, breaker trip, or
+  skipped items), so a caller can distinguish that from a clean run
+
+### `Notes` Stores Integer IDs, Not Names
+As of 2026-08-07 `Notes.RootBlogName`, `NoteBlogName` and `Type` are gone, replaced by
+`RootBlogId`, `NoteBlogId` and `TypeId` resolving through the `BlogNames` and `NoteTypes`
+lookup tables. There is no compatibility view — naming an old column is a hard SQLite
+error, so unlike `IsActive` this is a hard cut with no runtime probe. Full detail in
+`URLNotesGrabberCORE/TL.db.md`.
+
+- **Joining `Notes` to `Blogs` goes through `Blogs.BlogId`**, not `BlogNames`:
+  `FROM Blogs B INNER JOIN Notes N ON N.NoteBlogId = B.BlogId`. Routing it through
+  `BlogNames` adds a hop and ends in the text comparison the migration removed
+- **Joining `Notes` to `Posts` is the opposite** — `Posts` has only `BlogName`, so it must
+  go through `BlogNames` (`GetRepliesWithFilledText`). This is the only such join
+- **Resolve a name by filtering the lookup, never by scanning `Notes`**:
+  `WHERE NoteBlogId = (SELECT BlogId FROM BlogNames WHERE BlogName = @name)`. The subquery
+  is a unique-index probe on 20k rows and does not show against the 1.18M-row table
+- **`AddNote` registers both blog names *and* the note type** with `INSERT OR IGNORE`
+  before inserting, all in one transaction. `NoteTypes` is a table rather than a `CHECK`
+  constraint precisely so an unseen type is an `INSERT`; without that registration it
+  would resolve to `NULL` and fail the `NOT NULL` on `TypeId`, losing the note
+- **`Blogs.BlogId` is NULL on 168,202 of 188,620 rows** — every blog that has never
+  appeared in a note. An inner join on it silently drops them. Correct for engagement
+  queries, wrong for anything listing the registry
+- **IDs are stable and must never be renumbered.** They are stored in 1.18M `Notes` rows.
+  A blog renamed upstream gets a new `BlogNames` row, not an edited one
+- Prefer `TypeId = (SELECT TypeId FROM NoteTypes WHERE Type = 'reply')` over a hardcoded
+  ID. A negated `TypeId NOT IN (SELECT …)` is only correct because `TypeId` is `NOT NULL`
+- Duplicate-key detection uses `IsNotesDuplicateKey`, which matches the constraint and the
+  table rather than an exact column list. The old literal string comparison broke silently
+  on this rename — do not reintroduce one
+
+### `IsActive` Is Not Ours To Write
+`Blogs.IsActive`, `Posts.IsActive` and `Notes.IsActive` are removal flags set by other tools
+(Rolodex). `0` means removed; anything else, including `NULL`, means live. Full detail in
+`URLNotesGrabberCORE/TL.db.md`.
+
+- **Never write any `IsActive` column.** Not in an `INSERT` column list, not in an `UPDATE`,
+  and never via `INSERT OR REPLACE` on these tables — that resets the column default and
+  un-removes the row. Re-crawling a removed row must refresh its content and leave the flag
+  where it was
+- **Filter at selection, not at write.** Every query that *selects* posts, notes or blogs
+  excludes removed rows. Update statements stay keyed on a row the caller already selected;
+  filtering them would spend API quota and then fail to persist the result
+- `Posts.IsActive` and `Notes.IsActive` are **optional** — they are absent from databases
+  that predate them, and naming a missing column is a hard SQLite error. Compose the filter
+  with `AndIsActive`/`WhereIsActive` in `DataAccess.cs`, which return
+  `COALESCE(IsActive, 1) = 1` only when `HasIsActiveColumn` finds the column. `Blogs.IsActive`
+  is not optional and is filtered directly
+- Do not add these columns from this app, and do not add them to the missing-column list in
+  `verify-db-schema.sql`
+
+### `DateModified` Tracks Real Changes Only
+`Blogs.DateModified`, `Posts.DateModified` and `Notes.DateModified` must move only when a
+column beside `DateModified` itself actually changed. Re-crawling or re-ingesting identical
+content has to leave the row — and its timestamp — untouched, or downstream consumers cannot
+tell a refreshed row from a rewritten one.
+
+- Enforce it in the `WHERE` clause, not in C#. Every `UPDATE` that sets `DateModified` ends
+  with an `AND (<col> <> @param OR ...)` term covering every column in its `SET` list, so
+  SQLite matches zero rows on a no-op and never writes
+- Compare NULL-safely: `IFNULL(col, '') <> IFNULL(@param, '')` for text,
+  `IFNULL(col, 0) <> @param` for integer flags. A bare `col <> @param` is NULL on a NULL
+  column and silently skips the row that most needs writing
+- Where NULL is not equivalent to the default, spell it out. The `HasBeenOutput = 0` stamps
+  use `(HasBeenOutput IS NULL OR HasBeenOutput <> 0)` because the selection queries test
+  `HasBeenOutput = 0`, which a NULL would never match
+- Dynamic `SET` lists (`UpdatePostContentFields`) build the guard alongside the assignments
+  so the two lists cannot drift apart
+- These statements now return 0 rows for "found but unchanged" as well as "not found".
+  Callers that read `ExecuteNonQuery()` must not treat 0 as "row missing"
+
+**`Posts.NotesGatheredDateTime` is crawl bookkeeping, not content.** It moves on every
+`-collect` pass and says nothing about the post, so it must never move `DateModified` on its
+own. `UpdatePostMarkNotesCollected` still writes it every pass but wraps the timestamp in
+`DateModified = CASE WHEN IFNULL(HasNotesGathered, 0) <> 1 THEN @dateModified ELSE
+DateModified END` — SQLite evaluates `SET` expressions against the pre-`UPDATE` row, so only
+the flag flipping counts as a modification. Use this shape for any column that has to be
+refreshed unconditionally without being a change. `Blogs.LikesLastRefreshed` is the
+deliberate exception: a refresh pass is treated as a real event on the blog row.
+
+**`Blogs.DateAdded` is write-once.** `AddBlog`'s `INSERT` is the only place that sets it. A
+new post arriving for a known blog reopens `HasBeenOutput` but must leave `DateAdded` alone —
+a new post is not a new blog, and rewriting the column both destroys the registration date
+and makes every insert look like a change.
+
+**`"."` in a `Posts` content field means "not supplied", not "empty".** `ReblogRecord`
+(`TraverseDirectory`'s parser for the local `.txt` export tree) and the `--likes` API path
+both default every content field to the literal string `"."` when their source has no value
+for it, then pass that straight to `UpdatePost`. A blog with two export folders in different
+field formats (a duplicate `_2` folder, or a Tumblr export whose field set changed over time)
+sends one record with a real `Title`/`Tags`/`Slug` and another with those fields `"."`
+because that format never had a line for them — and without a guard, re-importing both on
+every run flips the row back and forth forever, bumping `DateModified` on every pass even
+though the true content never changes.
+
+- Every content column in `UpdatePost`'s `SET` list is guarded the same way `RootBlogName`/
+  `RootURL` already were: `col = CASE WHEN @col = '.' THEN col ELSE @col END`. A `"."`
+  parameter leaves the existing value alone instead of overwriting it
+- The change-detection `WHERE` clause carries the same exception —
+  `(@col <> '.' AND IFNULL(col, '') <> @col) OR ...` — so a `"."`-only difference does not
+  make the statement fire at all, and `DateModified` stays put
+- Deliberately narrow: only the literal `"."` is the sentinel. An explicit empty string from
+  a real record still overwrites, same as before this fix. `postID`, `BlogName`, `hasImage`,
+  `ByLikes` are not part of this convention and are unaffected
+- If a new content field is added to `Posts`/`UpdatePost`, decide explicitly whether its
+  source can legitimately supply `"."` as "field absent" before deciding whether it needs
+  the same `CASE` treatment — don't assume every column needs it
+
+**`--ingest` (`UpsertPostFromTextFile`) uses `NULL`, not `"."`, for the same "field absent"
+convention, and reconciling exactly this kind of duplicate IS the feature's job.**
+`IngestMode` strips a trailing `_N` from the folder name before it ever reaches
+`UpsertPostFromTextFile`, so a duplicate export folder collapses onto the same `BlogName` on
+purpose — the whole point is to merge multiple differently-formatted files for the same post
+into one row. `IngestMode.G(key)` returns `null` (not `"."`) when a field's line is absent
+from a given file, `LegacyPostsDbImporter` passes `null` straight from a `NULL` source column,
+and files are walked in raw filesystem enumeration order — never sorted — so which file's call
+lands last for a given `(BlogName, PostID)` is arbitrary.
+
+- Before the fix, the `UPDATE` branch set every column unconditionally, so whichever file
+  processed last for a `PostID` would null out every field its own record didn't carry —
+  silently erasing real `Title`/`Slug`/`Tags`/… another file had, the opposite of what
+  `--ingest` exists to do. This is worse than the `"."` case above: that one only caused
+  churn (the two writes canceled out); this one loses data, and which posts lose which
+  fields depends on filesystem enumeration order
+- Same shape of fix, `NULL` instead of `"."` as the sentinel: `col = CASE WHEN @col IS NULL
+  THEN col ELSE @col END` in the `SET` list, `(@col IS NOT NULL AND IFNULL(col, '') <> @col)
+  OR ...` in the change-detection
+- Same narrow rule: only `NULL` (the field's line was never present in this file) is the
+  sentinel. `G()` already distinguishes this from "present but blank" — a dictionary miss is
+  `null`, an empty value after the prefix is `""` — so an explicitly blank field still
+  overwrites
+- `HasImage` is **not** guarded and remains a known gap: `IngestMode` always computes a
+  concrete `bool` (defaulting `false` when a file has no `Has Image:` line), so there is no
+  way for this function to tell "this format says no image" from "this format doesn't report
+  it at all" without changing the parameter to `bool?` and threading that through
+  `IngestMode`/`LegacyPostsDbImporter`. Fix this the same way if `--ingest` is observed
+  downgrading a post's `HasImage` from `1` to `0`
+
 ### Testing
 - No existing test suite; use xUnit if adding tests
 - Test critical logic: `ApiKeyPool` init, color parsing, config persistence

RERUN.sqbpro

@@ -1,48 +1,100 @@
-<?xml version="1.0" encoding="UTF-8"?><sqlb_project><db path="C:/Users/jim/Nextcloud/C#/URLNotesGrabberCORE/URLNotesGrabberCORE/TL.db" readonly="0" foreign_keys="1" case_sensitive_like="0" temp_store="0" wal_autocheckpoint="1000" synchronous="2"/><attached/><window><main_tabs open="structure browser pragmas query" current="3"/></window><tab_structure><column_width id="0" width="300"/><column_width id="1" width="0"/><column_width id="2" width="100"/><column_width id="3" width="4253"/><column_width id="4" width="0"/><expanded_item id="0" parent="1"/><expanded_item id="1" parent="1"/><expanded_item id="2" parent="1"/><expanded_item id="3" parent="1"/></tab_structure><tab_browse><table title="ApiKeyPoolMeta" custom_title="0" dock_id="4" table="4,14:mainApiKeyPoolMeta"/><dock_state state="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"/><default_encoding codec=""/><browse_table_settings/></tab_browse><tab_sql><sql name="SQL 1">UPDATE Posts
-SET HasNotesGathered = 0
-WHERE (BlogName, PostID) IN (
-    SELECT p.BlogName, p.PostID
-    FROM Posts p
-    WHERE p.HasNotesGathered = 1
-	AND P.notesGatheredDatetime &lt; 1774294520
-    AND EXISTS (
-        SELECT 1 
-        FROM Notes n 
-        WHERE n.PostID = p.PostID 
-          AND n.RootBlogName = p.BlogName
-          --AND n.Type NOT IN ('reblog', 'reply')
-    )
-    ORDER BY P.PostDate ASC
-    --LIMIT 500
-);</sql><sql name="Mark Blogs">select *
-from Blogs
---update blogs set HasBeenOutput = 1
-where HasBeenOutput = 0
-AND
-blogname in
-(
-'teaberrybee',
-'reddevilgoddesstoo',
-'waywardog13',
-'wzjustbrowsing-blog',
-'lewerta',
-'nudenymph',
-'caylachief'
-
-)</sql><sql name="New Notes">select RootBlogName, PostID, NoteBlogName || '.tumblr.com' as NoteBlogName, DatetimeCrawled, TimeStamp, type, RootBlogName || '.tumblr.com/post/' || postid, datetime(timestamp, 'unixepoch')
-from Notes
-where --type like 'r%' and 
-DatetimeCrawled &lt;&gt; '2026-04-30 09:25:43'
-order by DatetimeCrawled desc, TimeStamp desc</sql><sql name="Pull Blogs">SELECT distinct
-	blogs.*
-	, blogname || '.tumblr.com'
-FROM
-	Blogs
-		inner JOIN
-	Notes on notes.noteBlogName = blogs.BlogName
-WHERE
-	HasBeenOutput = 0 and type = 'reblog'
-order by
-	Notes.Type desc,
-	DateAdded desc
-LIMIT 100;</sql><current_tab id="1"/></tab_sql></sqlb_project>
+<?xml version="1.0" encoding="UTF-8"?><sqlb_project><db path="D:/NextCloud/C#/URLNotesGrabberCORE/URLNotesGrabberCORE/TL.db" readonly="0" foreign_keys="1" case_sensitive_like="0" temp_store="0" wal_autocheckpoint="1000" synchronous="2"/><attached/><window><main_tabs open="structure browser pragmas query" current="3"/></window><tab_structure><column_width id="0" width="300"/><column_width id="1" width="0"/><column_width id="2" width="100"/><column_width id="3" width="4486"/><column_width id="4" width="0"/><expanded_item id="0" parent="1"/><expanded_item id="1" parent="1"/><expanded_item id="2" parent="1"/><expanded_item id="3" parent="1"/></tab_structure><tab_browse><table title="Posts" custom_title="0" dock_id="4" table="4,5:mainPosts"/><dock_state state="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"/><default_encoding codec=""/><browse_table_settings><table schema="main" name="ApiKeyPoolMeta" show_row_id="0" encoding="" plot_x_axis="" unlock_view_pk="_rowid_" freeze_columns="0"><sort/><column_widths><column index="1" value="29"/><column index="2" value="64"/></column_widths><filter_values/><conditional_formats/><row_id_formats/><display_formats/><hidden_columns/><plot_y_axes/><global_filter/></table><table schema="main" name="Blogs" show_row_id="0" encoding="" plot_x_axis="" unlock_view_pk="_rowid_" freeze_columns="0"><sort><column index="7" mode="1"/></sort><column_widths><column index="1" value="257"/><column index="2" value="108"/><column index="3" value="63"/><column index="4" value="156"/><column index="5" value="60"/><column index="6" value="81"/><column index="7" value="85"/><column index="8" value="156"/><column index="9" value="156"/><column index="10" value="151"/><column index="11" value="125"/><column index="12" value="129"/></column_widths><filter_values><column index="4" value="1"/><column index="7" value="&gt;2026-05-27 17:22:36"/></filter_values><conditional_formats/><row_id_formats/><display_formats/><hidden_columns/><plot_y_axes/><global_filter/></table><table schema="main" name="Notes" show_row_id="0" encoding="" plot_x_axis="" unlock_view_pk="_rowid_" freeze_columns="0"><sort/><column_widths><column index="1" value="198"/><column index="2" value="144"/><column index="3" value="251"/><column index="4" value="84"/><column index="5" value="53"/><column index="6" value="300"/><column index="7" value="116"/><column index="8" value="152"/><column index="9" value="89"/><column index="10" value="63"/></column_widths><filter_values/><conditional_formats/><row_id_formats/><display_formats/><hidden_columns/><plot_y_axes/><global_filter/></table><table schema="main" name="Posts" show_row_id="0" encoding="" plot_x_axis="" unlock_view_pk="_rowid_" freeze_columns="0"><sort><column index="14" mode="1"/></sort><column_widths><column index="1" value="236"/><column index="2" value="144"/><column index="3" value="126"/><column index="4" value="32"/><column index="5" value="32"/><column index="6" value="32"/><column index="7" value="32"/><column index="8" value="32"/><column index="9" value="0"/><column index="10" value="0"/><column index="11" value="0"/><column index="12" value="243"/><column index="13" value="300"/><column index="14" value="53"/><column index="15" value="37351"/><column index="16" value="300"/><column index="17" value="41"/><column index="18" value="75"/><column index="19" value="96"/><column index="20" value="300"/><column index="21" value="96"/><column index="22" value="300"/><column index="23" value="300"/><column index="24" value="548"/><column index="25" value="60"/><column index="26" value="213"/><column index="27" value="532"/><column index="28" value="152"/><column index="29" value="152"/><column index="30" value="69"/><column index="31" value="63"/></column_widths><filter_values><column index="2" value="0"/><column index="1" value="734568371821084672"/></filter_values><conditional_formats/><row_id_formats/><display_formats/><hidden_columns><column index="9" value="1"/><column index="10" value="1"/><column index="11" value="1"/></hidden_columns><plot_y_axes/><global_filter/></table></browse_table_settings></tab_browse><tab_sql><sql name="SQL 1">UPDATE Posts
+SET HasNotesGathered = 0
+WHERE (BlogName, PostID) IN (
+    SELECT p.BlogName, p.PostID
+    FROM Posts p
+    WHERE p.HasNotesGathered = 1
+	AND P.notesGatheredDatetime &lt; 1774294520
+    AND EXISTS (
+        SELECT 1 
+        FROM Notes n 
+        WHERE n.PostID = p.PostID 
+          AND n.RootBlogName = p.BlogName
+          --AND n.Type NOT IN ('reblog', 'reply')
+    )
+    ORDER BY P.PostDate ASC
+    --LIMIT 500
+);</sql><sql name="Mark Blogs">select *
+from Blogs
+--update blogs set HasBeenOutput = 1
+where HasBeenOutput = 0
+AND
+blogname in
+(
+'teaberrybee',
+'reddevilgoddesstoo',
+'waywardog13',
+'wzjustbrowsing-blog',
+'lewerta',
+'nudenymph',
+'caylachief'
+
+)</sql><sql name="New Notes">select P.slug, N.replyText, n.RootBlogName, n.PostID, NoteBlogName || '.tumblr.com' as NoteBlogName, DatetimeCrawled, TimeStamp, type, n.RootBlogName || '.tumblr.com/post/' || n.postid, datetime(timestamp, 'unixepoch')
+from Notes N inner join Posts P on p.PostID = n.PostID
+where 
+DatetimeCrawled &gt; '2026-08-07 11:47:22' and type like 'r%'
+and P.IsActive = 1 
+order by n.DatetimeCrawled</sql><sql name="Pull Blogs">SELECT distinct
+	'''' || blogname || ''',',
+	blogs.*
+	, blogname || '.tumblr.com'
+FROM
+	Blogs
+		inner JOIN
+	Notes on notes.noteBlogName = blogs.BlogName
+WHERE
+	HasBeenOutput = 0 and type = 'reblog'
+order by
+	Notes.Type desc,
+	DateAdded desc
+LIMIT 100;</sql><sql name="SQL 7">WITH ReplyCounts AS (
+    SELECT 
+        NoteBlogName, 
+        COUNT(DISTINCT replyText) AS DistinctReplyCount
+    FROM Notes
+	where replyText &lt;&gt; '.'
+    GROUP BY NoteBlogName
+)
+SELECT 
+    n.RootBlogName || '.tumblr.com/post/' || n.PostID AS PostURL, postid,
+    n.NoteBlogName,
+    n.replyText,
+    c.DistinctReplyCount
+FROM Notes n
+JOIN ReplyCounts c ON n.NoteBlogName = c.NoteBlogName
+where replyText &lt;&gt; '.' and type &lt;&gt; 'reply'
+--AND N.NoteBlogName NOT IN ( 'roadblocker21', 'thesaddemon666', 'edwardabbeyhoffman', 'tattedsoldier20', 'zomb-eh', 'animalistic13', 'indken', 'maccloud1592',
+--'moss-wizard', 'supertrucker12682', 'exploringthrupics', 'padeyepete' )
+order by c.DistinctReplyCount desc, n.NoteBlogName, n.DateModified desc, replyText, RootBlogName, PostID</sql><sql name="Collect">WITH PostsWithCount AS ( SELECT P.BlogName, P.PostID, 1925013599 AS LatestNoteTimestamp, P.NotesGatheredDateTime, COUNT(P.PostID) OVER(PARTITION BY P.BlogName) AS CNT, P.HasNotesGathered, P.NotFound, P.PostDate FROM Posts P WHERE COALESCE(P.IsActive, 1) = 1 ), Unioned AS ( SELECT BlogName, PostID, LatestNoteTimestamp, NotesGatheredDateTime, CNT, PostDate FROM PostsWithCount WHERE NotFound = 0 AND HasNotesGathered = 0 UNION SELECT BlogName, PostID, LatestNoteTimestamp, NotesGatheredDateTime, CNT, PostDate FROM PostsWithCount WHERE BlogName = 'zomb-eh' AND NotFound = 0 AND NotesGatheredDateTime &lt; unixepoch('now', 'localtime', '-3 days') ) SELECT U.BlogName, U.PostID, U.LatestNoteTimestamp, U.NotesGatheredDateTime, U.CNT FROM Unioned U WHERE (U.NotesGatheredDateTime &lt; 1786134037 OR U.NotesGatheredDateTime IS NULL) ORDER BY U.NotesGatheredDateTime, U.PostDate DESC, U.BlogName, U.PostID;</sql><sql name="Del Posts">delete from posts where postid in 
+(
+'741662499571728384',
+178892849664,
+178264721139,
+177012868749,
+169950081964,
+755440787056099328
+)</sql><sql name="notes NO post*">select *
+-- delete
+from notes
+where postid not in (select distinct postid from posts where IsActive = 1)</sql><sql name="SQL 9">SELECT	
+	*
+FROM	
+	POSTS P
+WHERE	
+	P.ByLikes = 1
+	AND
+	P.DateCreated &gt; '2026-05-26 17:47:32'
+ORDER BY
+	P.DateCreated desc</sql><sql name="SQL 13">update posts set IsActive = 0 where blogname IN ( 'shoebiedoo', 'redheaded-girlygirl', 'xlittle-ghost' )</sql><sql name="SQL 14*">update Posts␍
+set IsActive = 0␍
+where postid in␍
+(␍
+␍
+␍
+'731937314675310592'␍
+␍
+␍
+␍
+)␍
+␍
+</sql><current_tab id="7"/></tab_sql></sqlb_project>

URLNotesGrabberCORE/CorrectMode.cs

@@ -0,0 +1,277 @@
+using Microsoft.Extensions.Configuration;
+
+namespace URLNotesGrabberCORE
+{
+    // Port of ThreeTxtFileHelper RunCorrectionMode (dry-run) and RunFullCorrectionMode (apply).
+    // Scans a BAK directory of .txt files, parses posts with multi-line field support,
+    // and either reports or applies content-column corrections to TL.db.Posts.
+    // Apply path only writes non-empty values (mirrors original ThreeTxtFileHelper semantics)
+    // and never touches engagement columns.
+    public static class CorrectMode
+    {
+        public static int Run(IConfiguration config, string[] args, bool applyChanges)
+        {
+            DataAccess.EnsureTTFileHelperColumnsExist();
+
+            // Resolve BAK path: explicit arg > appSettings:PathTTBackup > derive from PathTTRoot/PathInput
+            string? bakRootPath = args.Length > 0 ? args[0] : config["appSettings:PathTTBackup"];
+            if (string.IsNullOrWhiteSpace(bakRootPath))
+            {
+                string? root = config["appSettings:PathTTRoot"];
+                if (string.IsNullOrWhiteSpace(root)) root = config["appSettings:PathInput"];
+                if (!string.IsNullOrWhiteSpace(root))
+                    bakRootPath = root.TrimEnd('\\', '/') + "_BAK\\";
+            }
+
+            if (string.IsNullOrWhiteSpace(bakRootPath) || !Directory.Exists(bakRootPath))
+            {
+                Console.WriteLine($"BAK directory not found: {bakRootPath}");
+                return 1;
+            }
+
+            Console.WriteLine($"BAK source path: {bakRootPath}");
+            Console.WriteLine(applyChanges
+                ? "Correction mode: APPLY - non-empty fields from BAK overwrite DB columns\n"
+                : "Correction mode: Dry-run - reports multi-line field updates available\n");
+
+            string prefixesPath = config["appSettings:PathPrefixes"] ?? "prefixes.txt";
+            if (!Path.IsPathRooted(prefixesPath))
+                prefixesPath = Path.Combine(AppContext.BaseDirectory, prefixesPath);
+            if (!File.Exists(prefixesPath))
+            {
+                Console.WriteLine($"Prefixes file not found: {prefixesPath}");
+                return 1;
+            }
+            var allowedPrefixes = new HashSet<string>(File.ReadLines(prefixesPath), StringComparer.OrdinalIgnoreCase);
+
+            if (applyChanges)
+            {
+                Console.Write("WARNING: This will overwrite non-empty fields in matching posts from BAK files. Continue? (yes/no): ");
+                string? response = Console.ReadLine();
+                if (string.IsNullOrWhiteSpace(response) || !response.Equals("yes", StringComparison.OrdinalIgnoreCase))
+                {
+                    Console.WriteLine("Operation cancelled.");
+                    return 0;
+                }
+            }
+
+            var bakTxtFiles = new List<string>();
+            try
+            {
+                foreach (var dir in Directory.GetDirectories(bakRootPath, "*", SearchOption.AllDirectories))
+                    bakTxtFiles.AddRange(Directory.GetFiles(dir, "*.txt"));
+                bakTxtFiles.AddRange(Directory.GetFiles(bakRootPath, "*.txt"));
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error scanning BAK directory: {ex.Message}");
+                return 1;
+            }
+            Console.WriteLine($"Found {bakTxtFiles.Count} file(s) in BAK directory\n");
+
+            int totalPostsFound = 0;
+            int postsWithUpdates = 0;
+            int postsUpdated = 0;
+            int postsNotFound = 0;
+            var correctionLog = new List<string>();
+            var updateLog = new List<string>();
+
+            foreach (string bakFile in bakTxtFiles)
+            {
+                Console.WriteLine($"Processing BAK file: {Path.GetFileName(bakFile)}");
+                try
+                {
+                    var bakPosts = ParsePostsFromFile(bakFile, allowedPrefixes);
+                    Console.WriteLine($"  Found {bakPosts.Count} post(s) in this file");
+
+                    foreach (var (postId, bakData) in bakPosts)
+                    {
+                        totalPostsFound++;
+                        var dbPost = DataAccess.GetPostByIdAnyBlog(postId);
+                        if (dbPost == null)
+                        {
+                            postsNotFound++;
+                            continue;
+                        }
+
+                        if (applyChanges)
+                        {
+                            bool updated = DataAccess.UpdatePostContentFields(dbPost.BlogName, dbPost.PostId, bakData);
+                            if (updated)
+                            {
+                                postsUpdated++;
+                                updateLog.Add($"Post ID: {postId} - Updated from {Path.GetFileName(bakFile)}");
+                            }
+                        }
+                        else
+                        {
+                            var updateList = BuildDryRunDiff(bakData, dbPost);
+                            if (updateList.Count > 0)
+                            {
+                                postsWithUpdates++;
+                                correctionLog.Add($"\nPost ID: {postId}");
+                                correctionLog.Add($"  File: {Path.GetFileName(bakFile)}");
+                                correctionLog.Add($"  Fields to update:");
+                                correctionLog.AddRange(updateList);
+                            }
+                        }
+                    }
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"  ERROR processing file: {ex.Message}");
+                }
+            }
+
+            if (applyChanges)
+            {
+                Console.WriteLine($"\n========== CORRECTION COMPLETE ==========");
+                Console.WriteLine($"Total posts found in BAK files: {totalPostsFound}");
+                Console.WriteLine($"Posts updated in database:      {postsUpdated}");
+                Console.WriteLine($"Posts not found in database:    {postsNotFound}");
+
+                string logPath = config["appSettings:PathCorrectionApplied"] ?? "correction_applied.txt";
+                try
+                {
+                    var logLines = new List<string>
+                    {
+                        $"Correction Applied: {DateTime.Now:yyyy-MM-dd HH:mm:ss}",
+                        $"Total posts found in BAK files: {totalPostsFound}",
+                        $"Posts updated in database:      {postsUpdated}",
+                        $"Posts not found in database:    {postsNotFound}",
+                        "",
+                        "Updated Posts:"
+                    };
+                    logLines.AddRange(updateLog);
+                    File.WriteAllLines(logPath, logLines);
+                    Console.WriteLine($"Update log saved to: {logPath}");
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"Error writing log file: {ex.Message}");
+                }
+            }
+            else
+            {
+                Console.WriteLine($"\n========== CORRECTION REPORT (DRY RUN) ==========");
+                Console.WriteLine($"Total posts found in BAK files: {totalPostsFound}");
+                Console.WriteLine($"Posts with multi-line field updates available: {postsWithUpdates}");
+
+                if (correctionLog.Count > 0)
+                {
+                    string logPath = config["appSettings:PathCorrectionReport"] ?? "correction_report.txt";
+                    try
+                    {
+                        File.WriteAllLines(logPath, correctionLog);
+                        Console.WriteLine($"\nDetailed report saved to: {logPath}");
+                    }
+                    catch (Exception ex)
+                    {
+                        Console.WriteLine($"Error writing report file: {ex.Message}");
+                    }
+                }
+                else
+                {
+                    Console.WriteLine("\nNo multi-line field updates found.");
+                }
+
+                Console.WriteLine("\nDry-run complete. No database changes were made.");
+                Console.WriteLine("If updates look correct, re-run with `-correct -apply` to apply changes.");
+            }
+            return 0;
+        }
+
+        private static List<string> BuildDryRunDiff(Dictionary<string, string> bakData, TTPostRecord dbPost)
+        {
+            var updates = new List<string>();
+            foreach (var (fieldName, bakValue) in bakData)
+            {
+                if (string.IsNullOrWhiteSpace(bakValue)) continue;
+                string? currentValue = fieldName.ToLowerInvariant() switch
+                {
+                    "reblog url" => dbPost.ReblogUrl,
+                    "date" => dbPost.Date,
+                    "has image" => dbPost.HasImage,
+                    "post url" => dbPost.PostUrl,
+                    "slug" => dbPost.Slug,
+                    "reblog key" => dbPost.ReblogKey,
+                    "reblog name" => dbPost.ReblogName,
+                    "summary" => dbPost.Summary,
+                    "quote" => dbPost.Quote,
+                    "body" => dbPost.Body,
+                    "tags" => dbPost.Tags,
+                    "link" => dbPost.Link,
+                    "photo url" => dbPost.PhotoUrl,
+                    "photo caption" => dbPost.PhotoCaption,
+                    "downloaded files" => dbPost.DownloadedFiles,
+                    "audio caption" => dbPost.AudioCaption,
+                    "question" => dbPost.Question,
+                    "answer" => dbPost.Answer,
+                    "title" => dbPost.Title,
+                    _ => null
+                };
+                if (bakValue != currentValue && bakValue.Contains('\n'))
+                    updates.Add($"    {fieldName}: [MULTILINE]");
+            }
+            return updates;
+        }
+
+        private static Dictionary<string, Dictionary<string, string>> ParsePostsFromFile(string filePath, HashSet<string> allowedPrefixes)
+        {
+            var posts = new Dictionary<string, Dictionary<string, string>>(StringComparer.OrdinalIgnoreCase);
+            var lines = File.ReadAllLines(filePath);
+            int lineIndex = 0;
+            string currentPostId = "";
+            var currentPostData = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+
+            while (lineIndex < lines.Length)
+            {
+                string line = lines[lineIndex];
+                string searchText = line.Length > 25 ? line.Substring(0, 25) : line;
+                int colonIndex = searchText.IndexOf(": ");
+
+                if (colonIndex > 0)
+                {
+                    string prefix = line.Substring(0, colonIndex).Trim();
+                    if (!string.IsNullOrWhiteSpace(prefix) && allowedPrefixes.Contains(prefix))
+                    {
+                        if (string.Equals(prefix, "Post ID", StringComparison.OrdinalIgnoreCase))
+                        {
+                            if (!string.IsNullOrWhiteSpace(currentPostId) && currentPostData.Count > 0)
+                                posts[currentPostId] = new Dictionary<string, string>(currentPostData, StringComparer.OrdinalIgnoreCase);
+                            currentPostId = line.Substring(colonIndex + 2).Trim();
+                            currentPostData.Clear();
+                            lineIndex++;
+                            continue;
+                        }
+
+                        var valueLines = new List<string> { line.Substring(colonIndex + 2).Trim() };
+                        int nextLineIndex = lineIndex + 1;
+                        while (nextLineIndex < lines.Length)
+                        {
+                            string nextLine = lines[nextLineIndex];
+                            string nextSearch = nextLine.Length > 25 ? nextLine.Substring(0, 25) : nextLine;
+                            int nextColon = nextSearch.IndexOf(": ");
+                            if (nextColon > 0)
+                            {
+                                string nextPrefix = nextLine.Substring(0, nextColon).Trim();
+                                if (!string.IsNullOrWhiteSpace(nextPrefix) && allowedPrefixes.Contains(nextPrefix))
+                                    break;
+                            }
+                            valueLines.Add(nextLine);
+                            nextLineIndex++;
+                        }
+                        currentPostData[prefix] = string.Join("\n", valueLines);
+                        lineIndex = nextLineIndex;
+                        continue;
+                    }
+                }
+                lineIndex++;
+            }
+            if (!string.IsNullOrWhiteSpace(currentPostId) && currentPostData.Count > 0)
+                posts[currentPostId] = new Dictionary<string, string>(currentPostData, StringComparer.OrdinalIgnoreCase);
+
+            return posts;
+        }
+    }
+}

URLNotesGrabberCORE/IngestMode.cs

@@ -0,0 +1,219 @@
+using System.Text.RegularExpressions;
+using Microsoft.Extensions.Configuration;
+
+namespace URLNotesGrabberCORE
+{
+    // Port of ThreeTxtFileHelper RunIngestMode. Scans a root folder for .txt files,
+    // parses Tumblr-export fields (multi-line aware, prefix-driven), upserts each
+    // post into TL.db.Posts via DataAccess.UpsertPostFromTextFile.
+    public static class IngestMode
+    {
+        public static int Run(IConfiguration config, string[] args)
+        {
+            string? targetBlog = args.Length > 0 ? args[0]?.Trim() : null;
+            if (string.IsNullOrWhiteSpace(targetBlog)) targetBlog = null;
+
+            string? rootPath = config["appSettings:PathTTRoot"];
+            if (string.IsNullOrWhiteSpace(rootPath))
+                rootPath = config["appSettings:PathInput"];
+
+            if (string.IsNullOrWhiteSpace(rootPath))
+            {
+                Console.WriteLine("Ingest: no root path configured. Set appSettings:PathTTRoot or appSettings:PathInput.");
+                return 1;
+            }
+
+            if (!Directory.Exists(rootPath))
+            {
+                Console.WriteLine($"Directory not found: {rootPath}");
+                return 1;
+            }
+
+            DataAccess.EnsureTTFileHelperColumnsExist();
+
+            string prefixesPath = config["appSettings:PathPrefixes"] ?? "prefixes.txt";
+            if (!Path.IsPathRooted(prefixesPath))
+                prefixesPath = Path.Combine(AppContext.BaseDirectory, prefixesPath);
+
+            if (!File.Exists(prefixesPath))
+            {
+                Console.WriteLine($"Prefixes file not found: {prefixesPath}");
+                return 1;
+            }
+
+            var allowedPrefixes = new HashSet<string>(File.ReadLines(prefixesPath), StringComparer.OrdinalIgnoreCase);
+            Console.WriteLine($"Loaded {allowedPrefixes.Count} prefixes from {prefixesPath}");
+
+            Console.WriteLine($"========== Ingest Settings ==========");
+            Console.WriteLine($"Root path: {rootPath}");
+            Console.WriteLine($"Blog filter: {(targetBlog == null ? "(all blogs)" : targetBlog)}");
+            Console.WriteLine($"=====================================");
+
+            var txtFiles = new List<string>();
+            try
+            {
+                var dirs = Directory.GetDirectories(rootPath, "*", SearchOption.AllDirectories);
+                Console.WriteLine($"Found {dirs.Length} directories under root.");
+                foreach (var dir in dirs)
+                {
+                    try { txtFiles.AddRange(Directory.GetFiles(dir, "*.txt")); }
+                    catch (Exception ex) { Console.WriteLine($"  Skipping {dir}: {ex.Message}"); }
+                }
+                txtFiles.AddRange(Directory.GetFiles(rootPath, "*.txt"));
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error scanning root: {ex.Message}");
+                return 1;
+            }
+
+            Console.WriteLine($"Processing {txtFiles.Count} .txt file(s)...");
+
+            int filesProcessed = 0;
+            int filesSkipped = 0;
+            int postsTouched = 0;
+            string? lastBlogFolder = null;
+
+            try
+            {
+                DataAccess.EnableImportModePragmas();
+                DataAccess.BeginImportSession();
+
+                foreach (string file in txtFiles)
+                {
+                    try
+                    {
+                        string rawBlogName = Path.GetFileName(Path.GetDirectoryName(file) ?? "unknown");
+                        string blogName = Regex.Replace(rawBlogName, @"_\d+$", "");
+                        string postType = Path.GetFileNameWithoutExtension(file);
+
+                        if (targetBlog != null && !string.Equals(blogName, targetBlog, StringComparison.OrdinalIgnoreCase))
+                        {
+                            filesSkipped++;
+                            continue;
+                        }
+
+                        filesProcessed++;
+
+                        if (lastBlogFolder != rawBlogName)
+                        {
+                            Console.WriteLine($"[{filesProcessed}/{txtFiles.Count}] >> entering folder: {rawBlogName}");
+                            lastBlogFolder = rawBlogName;
+                        }
+                        else if (filesProcessed % 50 == 0)
+                        {
+                            Console.WriteLine($"[{filesProcessed}/{txtFiles.Count}] {rawBlogName}/{Path.GetFileName(file)}");
+                        }
+
+                        string currentPostId = "";
+                        var currentPostData = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+
+                        void Flush()
+                        {
+                            if (!string.IsNullOrWhiteSpace(currentPostId) && currentPostData.Count > 0)
+                            {
+                                UpsertPostFromParsedData(blogName, currentPostId, postType, currentPostData);
+                                postsTouched++;
+                            }
+                        }
+
+                        var lines = File.ReadAllLines(file);
+                        int lineIndex = 0;
+                        while (lineIndex < lines.Length)
+                        {
+                            string line = lines[lineIndex];
+                            string searchText = line.Length > 25 ? line.Substring(0, 25) : line;
+                            int colonIndex = searchText.IndexOf(": ");
+
+                            if (colonIndex > 0)
+                            {
+                                string prefix = line.Substring(0, colonIndex).Trim();
+                                if (!string.IsNullOrWhiteSpace(prefix) && allowedPrefixes.Contains(prefix))
+                                {
+                                    if (string.Equals(prefix, "Post ID", StringComparison.OrdinalIgnoreCase))
+                                    {
+                                        Flush();
+                                        currentPostId = line.Substring(colonIndex + 2).Trim();
+                                        currentPostData.Clear();
+                                        lineIndex++;
+                                        continue;
+                                    }
+
+                                    var valueLines = new List<string> { line.Substring(colonIndex + 2).Trim() };
+                                    int nextLineIndex = lineIndex + 1;
+                                    while (nextLineIndex < lines.Length)
+                                    {
+                                        string nextLine = lines[nextLineIndex];
+                                        string nextSearch = nextLine.Length > 25 ? nextLine.Substring(0, 25) : nextLine;
+                                        int nextColon = nextSearch.IndexOf(": ");
+                                        if (nextColon > 0)
+                                        {
+                                            string nextPrefix = nextLine.Substring(0, nextColon).Trim();
+                                            if (!string.IsNullOrWhiteSpace(nextPrefix) && allowedPrefixes.Contains(nextPrefix))
+                                                break;
+                                        }
+                                        valueLines.Add(nextLine);
+                                        nextLineIndex++;
+                                    }
+
+                                    currentPostData[prefix] = string.Join("\n", valueLines);
+                                    lineIndex = nextLineIndex;
+                                    continue;
+                                }
+                            }
+                            lineIndex++;
+                        }
+
+                        Flush();
+                    }
+                    catch (Exception ex)
+                    {
+                        Console.WriteLine($"  ERROR processing file {file}: {ex.Message}");
+                    }
+                }
+            }
+            finally
+            {
+                DataAccess.EndImportSession();
+                DataAccess.RestoreImportModePragmas();
+            }
+
+            Console.WriteLine($"\nIngest complete. Files processed: {filesProcessed}. Files skipped (blog filter): {filesSkipped}. Posts touched: {postsTouched}.");
+            return 0;
+        }
+
+        private static void UpsertPostFromParsedData(string blogName, string postId, string postType, Dictionary<string, string> data)
+        {
+            string? G(string key) => data.TryGetValue(key, out var v) ? v : null;
+            string? hasImageStr = G("Has Image");
+            bool hasImage = !string.IsNullOrWhiteSpace(hasImageStr)
+                && (hasImageStr.Equals("true", StringComparison.OrdinalIgnoreCase)
+                    || hasImageStr == "1"
+                    || hasImageStr.Equals("yes", StringComparison.OrdinalIgnoreCase));
+
+            DataAccess.UpsertPostFromTextFile(
+                blogName: blogName,
+                postID: postId,
+                reblogURL: G("reblog URL"),
+                postDate: G("Date"),
+                postURL: G("Post URL"),
+                slug: G("Slug"),
+                reblogKey: G("Reblog Key"),
+                reblogName: G("Reblog Name"),
+                summary: G("Summary"),
+                quote: G("Quote"),
+                body: G("Body"),
+                tags: G("Tags"),
+                link: G("Link"),
+                photoURL: G("Photo URL"),
+                photoCaption: G("Photo Caption"),
+                downloadedFiles: G("Downloaded Files"),
+                audioCaption: G("Audio Caption"),
+                question: G("Question"),
+                answer: G("Answer"),
+                title: G("Title"),
+                postType: postType,
+                hasImage: hasImage);
+        }
+    }
+}

URLNotesGrabberCORE/LegacyPostsDbImporter.cs

@@ -0,0 +1,156 @@
+using System.Data.SQLite;
+
+namespace URLNotesGrabberCORE
+{
+    // One-time migration: opens a legacy ThreeTxtFileHelper posts.db, copies its
+    // Blog + PostData rows into the merged TL.db via DataAccess.
+    // Conflict rule on (BlogName, PostId): ThreeTxtFileHelper wins on the 22 content
+    // columns + PostType + DateModified (handled inside UpsertPostFromTextFile).
+    // Engagement columns in TL.db (ByLikes, RootBlogName, RootURL, HasNotesGathered,
+    // NotFound, NotesGatheredDateTime) are preserved.
+    public static class LegacyPostsDbImporter
+    {
+        public static int Run(string legacyDbPath)
+        {
+            if (string.IsNullOrWhiteSpace(legacyDbPath))
+            {
+                Console.WriteLine("LegacyPostsDbImporter: path to legacy posts.db is required.");
+                return 1;
+            }
+
+            if (!File.Exists(legacyDbPath))
+            {
+                Console.WriteLine($"Legacy posts.db not found at: {legacyDbPath}");
+                return 1;
+            }
+
+            DataAccess.EnsureTTFileHelperColumnsExist();
+
+            Console.WriteLine($"Reading legacy posts.db: {legacyDbPath}");
+
+            int blogsCopied = 0;
+            int blogPathsWritten = 0;
+            int blogsWithoutPath = 0;
+            int postsUpserted = 0;
+            int errors = 0;
+
+            try
+            {
+                using var src = new SQLiteConnection("Data Source=" + legacyDbPath + ";Read Only=True;");
+                src.Open();
+
+                // 1) Copy Blogs (BlogName + TTFolderPath)
+                using (var cmd = new SQLiteCommand("SELECT BlogName, TTFolderPath FROM Blogs", src))
+                using (var reader = cmd.ExecuteReader())
+                {
+                    while (reader.Read())
+                    {
+                        string blogName = reader.IsDBNull(0) ? string.Empty : reader.GetString(0);
+                        string? ttFolderPath = reader.IsDBNull(1) ? null : reader.GetString(1);
+                        if (string.IsNullOrWhiteSpace(blogName)) continue;
+                        try
+                        {
+                            // A legacy row whose TTFolderPath was already NULL copies nothing.
+                            // Counting it as "copied" is what hid the fact that this import has
+                            // never populated a single path.
+                            if (string.IsNullOrWhiteSpace(ttFolderPath))
+                                blogsWithoutPath++;
+                            else if (DataAccess.SetBlogTTFolderPath(blogName, ttFolderPath.Trim()))
+                                blogPathsWritten++;
+                            blogsCopied++;
+                        }
+                        catch (Exception ex)
+                        {
+                            errors++;
+                            Console.WriteLine($"  Blog copy failed for '{blogName}': {ex.Message}");
+                        }
+                    }
+                }
+                Console.WriteLine($"  Blogs seen: {blogsCopied}, TTFolderPath written: {blogPathsWritten}, legacy rows with no path: {blogsWithoutPath}");
+
+                // 2) Copy Posts
+                try
+                {
+                    DataAccess.EnableImportModePragmas();
+                    DataAccess.BeginImportSession();
+
+                    string sql = @"SELECT BlogName, PostId, ReblogUrl, Date, HasImage, PostUrl, Slug,
+                                          ReblogKey, ReblogName, Summary, Quote, Body, Tags, Link,
+                                          PhotoUrl, PhotoCaption, DownloadedFiles, AudioCaption,
+                                          Question, Answer, Title, PostType
+                                   FROM Posts";
+
+                    using var cmd = new SQLiteCommand(sql, src);
+                    using var reader = cmd.ExecuteReader();
+                    while (reader.Read())
+                    {
+                        try
+                        {
+                            string blogName = reader.IsDBNull(0) ? string.Empty : reader.GetString(0);
+                            string postId = reader.IsDBNull(1) ? string.Empty : reader.GetString(1);
+                            if (string.IsNullOrWhiteSpace(blogName) || string.IsNullOrWhiteSpace(postId)) continue;
+
+                            string? hasImageRaw = reader.IsDBNull(4) ? null : reader.GetValue(4)?.ToString();
+                            bool hasImage = !string.IsNullOrWhiteSpace(hasImageRaw)
+                                && (hasImageRaw.Equals("true", StringComparison.OrdinalIgnoreCase)
+                                    || hasImageRaw == "1"
+                                    || hasImageRaw.Equals("yes", StringComparison.OrdinalIgnoreCase));
+
+                            DataAccess.UpsertPostFromTextFile(
+                                blogName: blogName,
+                                postID: postId,
+                                reblogURL: reader.IsDBNull(2) ? null : reader.GetString(2),
+                                postDate: reader.IsDBNull(3) ? null : reader.GetString(3),
+                                postURL: reader.IsDBNull(5) ? null : reader.GetString(5),
+                                slug: reader.IsDBNull(6) ? null : reader.GetString(6),
+                                reblogKey: reader.IsDBNull(7) ? null : reader.GetString(7),
+                                reblogName: reader.IsDBNull(8) ? null : reader.GetString(8),
+                                summary: reader.IsDBNull(9) ? null : reader.GetString(9),
+                                quote: reader.IsDBNull(10) ? null : reader.GetString(10),
+                                body: reader.IsDBNull(11) ? null : reader.GetString(11),
+                                tags: reader.IsDBNull(12) ? null : reader.GetString(12),
+                                link: reader.IsDBNull(13) ? null : reader.GetString(13),
+                                photoURL: reader.IsDBNull(14) ? null : reader.GetString(14),
+                                photoCaption: reader.IsDBNull(15) ? null : reader.GetString(15),
+                                downloadedFiles: reader.IsDBNull(16) ? null : reader.GetString(16),
+                                audioCaption: reader.IsDBNull(17) ? null : reader.GetString(17),
+                                question: reader.IsDBNull(18) ? null : reader.GetString(18),
+                                answer: reader.IsDBNull(19) ? null : reader.GetString(19),
+                                title: reader.IsDBNull(20) ? null : reader.GetString(20),
+                                postType: reader.IsDBNull(21) ? null : reader.GetString(21),
+                                hasImage: hasImage);
+                            postsUpserted++;
+                            if (postsUpserted % 500 == 0)
+                                Console.WriteLine($"  ... {postsUpserted} posts upserted");
+                        }
+                        catch (Exception ex)
+                        {
+                            errors++;
+                            if (errors < 20)
+                                Console.WriteLine($"  Post upsert error: {ex.Message}");
+                        }
+                    }
+                }
+                finally
+                {
+                    DataAccess.EndImportSession();
+                    DataAccess.RestoreImportModePragmas();
+                }
+
+                Console.WriteLine($"  Posts upserted: {postsUpserted}");
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Fatal error reading legacy posts.db: {ex.Message}");
+                return 1;
+            }
+
+            Console.WriteLine($"\n========== Legacy import summary ==========");
+            Console.WriteLine($"Blogs seen:      {blogsCopied}");
+            Console.WriteLine($"Paths written:   {blogPathsWritten} (legacy rows with no path: {blogsWithoutPath})");
+            Console.WriteLine($"Posts upserted:  {postsUpserted}");
+            Console.WriteLine($"Errors:          {errors}");
+            return errors == 0 ? 0 : 2;
+        }
+    }
+}

URLNotesGrabberCORE/OutputMode.cs

@@ -0,0 +1,206 @@
+using Microsoft.Extensions.Configuration;
+
+namespace URLNotesGrabberCORE
+{
+    // Port of ThreeTxtFileHelper RunOutputMode + WritePostToFile + RenameExistingTxtFilesToBak.
+    // For each Blog with a TTFolderPath, renames any existing .txt files in that folder to .bak,
+    // then writes one .txt per PostType containing all posts of that type (date-sorted, fixed
+    // field order). Reads from TL.db via DataAccess.GetAllPostsForBlog.
+    public static class OutputMode
+    {
+        public static int Run(IConfiguration config, string[]? args = null)
+        {
+            DataAccess.EnsureTTFileHelperColumnsExist();
+
+            string dbPath = DataAccess.GetActiveDbPath();
+            Console.WriteLine($"Database: {Path.GetFullPath(dbPath)}");
+
+            if (!RefreshPaths(config, args ?? Array.Empty<string>()))
+                return 1;
+
+            var blogs = DataAccess.GetAllBlogsWithTTFolderPath();
+            int activeBlogs = DataAccess.CountActiveBlogs();
+            Console.WriteLine($"{blogs.Count} of {activeBlogs} active blog(s) have a TTFolderPath.");
+
+            if (blogs.Count == 0)
+            {
+                Console.WriteLine($"\nNothing to export: no blog in {Path.GetFullPath(dbPath)} has a TTFolderPath.");
+                Console.WriteLine("Point --output at a TumblThree root so it can populate them: --output <root>,");
+                Console.WriteLine("or set appSettings:PathTTRoot so the refresh runs automatically.");
+                return 1;
+            }
+
+            int missingFolderCount = 0;
+            int writtenCount = 0;
+
+            foreach (var (blogName, folder) in blogs)
+            {
+                Console.WriteLine($"\nProcessing blog: {blogName}");
+
+                // A stored path that this machine cannot see means the value was written on
+                // another machine -- re-running --updatepaths locally is the fix, so say so
+                // rather than lumping it in with "not set".
+                if (!Directory.Exists(folder))
+                {
+                    Console.WriteLine($"  TTFolderPath folder not found: {folder}. Skipping.");
+                    missingFolderCount++;
+                    continue;
+                }
+
+                Console.WriteLine($"  TTFolderPath: {folder}");
+                writtenCount++;
+
+                try
+                {
+                    foreach (var bakFile in Directory.GetFiles(folder, "*.bak"))
+                        File.Delete(bakFile);
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"  Error deleting .bak files: {ex.Message}");
+                }
+
+                RenameExistingTxtFilesToBak(folder);
+
+                var posts = DataAccess.GetAllPostsForBlog(blogName);
+                Console.WriteLine($"  Found {posts.Count} post(s) for this blog.");
+
+                var grouped = posts.GroupBy(p => p.PostType ?? "Unknown");
+                foreach (var typeGroup in grouped)
+                {
+                    string postType = typeGroup.Key ?? "Unknown";
+                    string outputFilePath = Path.Combine(folder, $"{postType}.txt");
+                    var ordered = typeGroup.OrderBy(p => p.Date).ToList();
+                    Console.WriteLine($"    Writing {ordered.Count} post(s) to {postType}.txt");
+
+                    using var writer = new StreamWriter(outputFilePath, false, System.Text.Encoding.UTF8);
+                    bool isFirst = true;
+                    foreach (var post in ordered)
+                    {
+                        if (!isFirst)
+                        {
+                            writer.WriteLine();
+                            writer.WriteLine();
+                        }
+                        WritePostToFile(writer, post);
+                        isFirst = false;
+                    }
+                }
+            }
+
+            Console.WriteLine($"\nOutput mode complete. {writtenCount} blog(s) exported, {missingFolderCount} skipped for a missing folder.");
+
+            if (writtenCount == 0)
+                Console.WriteLine("Every TTFolderPath points at a folder this machine cannot see. The paths were most likely written on another machine -- re-run --updatepaths <root> here so they match local drive letters.");
+
+            return 0;
+        }
+
+        // Re-reads the TumblThree Index metadata into Blogs.TTFolderPath before exporting.
+        // A TL.db synced between machines cannot hold one absolute path that is valid on
+        // both, so the stored paths are only trustworthy on the machine that wrote them --
+        // which makes this refresh part of a normal export rather than a separate chore.
+        // Returns false only when the run should stop.
+        private static bool RefreshPaths(IConfiguration config, string[] args)
+        {
+            var settings = config.GetSection("appSettings");
+
+            if (args.Any(a => string.Equals(a, "--norefresh", StringComparison.OrdinalIgnoreCase)))
+            {
+                Console.WriteLine("Path refresh skipped (--norefresh); exporting to whatever paths TL.db already holds.");
+                return true;
+            }
+
+            string? root = args.FirstOrDefault(a => !a.StartsWith("--", StringComparison.Ordinal))
+                           ?? settings.GetValue<string>("PathTTRoot");
+
+            var result = UpdateBlogPathsRunner.Scan(root, verbose: false);
+
+            switch (result.Outcome)
+            {
+                case UpdateBlogPathsRunner.ScanOutcome.NoRootConfigured:
+                    Console.WriteLine("No TumblThree root configured (appSettings:PathTTRoot is empty and none was passed),");
+                    Console.WriteLine("so TTFolderPath was not refreshed. Pass one as --output <root> to refresh it.");
+                    return true;
+
+                case UpdateBlogPathsRunner.ScanOutcome.IndexFolderMissing:
+                    // Silently exporting stale paths here would defeat the point of folding
+                    // the refresh in, so a bad root is a hard stop.
+                    Console.WriteLine($"Index folder not found at: {result.IndexPath}");
+                    Console.WriteLine("Fix the root (or pass --norefresh to export the paths already in TL.db).");
+                    return false;
+
+                default:
+                    Console.WriteLine($"Refreshed paths from {result.IndexPath}: " +
+                                      $"{result.MetadataFiles} metadata file(s), {result.Written} written, " +
+                                      $"{result.Unchanged} already correct, {result.NoLocation} without a location, " +
+                                      $"{result.NoMatchingRow} without a blog row, {result.Errors} error(s).");
+                    return true;
+            }
+        }
+
+        private static void RenameExistingTxtFilesToBak(string folderPath)
+        {
+            try
+            {
+                foreach (var txtFile in Directory.GetFiles(folderPath, "*.txt"))
+                {
+                    string bakPath = Path.ChangeExtension(txtFile, ".bak");
+                    if (File.Exists(bakPath)) File.Delete(bakPath);
+                    File.Move(txtFile, bakPath, overwrite: true);
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"    Error renaming txt files to .bak: {ex.Message}");
+            }
+        }
+
+        private static void WritePostToFile(StreamWriter writer, TTPostRecord post)
+        {
+            var startColumns = new[] { "Post ID", "Date", "Post URL", "Slug", "Reblog Key", "Reblog URL", "Reblog Name", "Title", "Body" };
+            var endColumns = new[] { "Tags", "Downloaded Files" };
+
+            var columns = new Dictionary<string, string>();
+            if (!string.IsNullOrWhiteSpace(post.PostId)) columns["Post ID"] = post.PostId;
+            if (!string.IsNullOrWhiteSpace(post.Date)) columns["Date"] = post.Date!;
+            if (!string.IsNullOrWhiteSpace(post.PostUrl)) columns["Post URL"] = post.PostUrl!;
+            if (!string.IsNullOrWhiteSpace(post.Slug)) columns["Slug"] = post.Slug!;
+            if (!string.IsNullOrWhiteSpace(post.ReblogKey)) columns["Reblog Key"] = post.ReblogKey!;
+            if (!string.IsNullOrWhiteSpace(post.ReblogUrl)) columns["Reblog URL"] = post.ReblogUrl!;
+            if (!string.IsNullOrWhiteSpace(post.ReblogName)) columns["Reblog Name"] = post.ReblogName!;
+            if (!string.IsNullOrWhiteSpace(post.Title)) columns["Title"] = post.Title!;
+            if (!string.IsNullOrWhiteSpace(post.Body)) columns["Body"] = post.Body!;
+            if (!string.IsNullOrWhiteSpace(post.HasImage)) columns["Has Image"] = post.HasImage!;
+            if (!string.IsNullOrWhiteSpace(post.Summary)) columns["Summary"] = post.Summary!;
+            if (!string.IsNullOrWhiteSpace(post.Quote)) columns["Quote"] = post.Quote!;
+            if (!string.IsNullOrWhiteSpace(post.Link)) columns["Link"] = post.Link!;
+            if (!string.IsNullOrWhiteSpace(post.PhotoUrl)) columns["Photo URL"] = post.PhotoUrl!;
+            if (!string.IsNullOrWhiteSpace(post.PhotoCaption)) columns["Photo Caption"] = post.PhotoCaption!;
+            if (!string.IsNullOrWhiteSpace(post.AudioCaption)) columns["Audio Caption"] = post.AudioCaption!;
+            if (!string.IsNullOrWhiteSpace(post.Question)) columns["Question"] = post.Question!;
+            if (!string.IsNullOrWhiteSpace(post.Answer)) columns["Answer"] = post.Answer!;
+            if (!string.IsNullOrWhiteSpace(post.Tags)) columns["Tags"] = post.Tags!;
+            if (!string.IsNullOrWhiteSpace(post.DownloadedFiles)) columns["Downloaded Files"] = post.DownloadedFiles!;
+
+            foreach (var col in startColumns)
+            {
+                if (columns.ContainsKey(col))
+                {
+                    writer.WriteLine($"{col}: {columns[col]}");
+                    columns.Remove(col);
+                }
+            }
+
+            var remaining = columns.Keys.Where(k => !endColumns.Contains(k)).OrderBy(k => k).ToList();
+            foreach (var col in remaining)
+                writer.WriteLine($"{col}: {columns[col]}");
+
+            foreach (var col in endColumns)
+            {
+                if (columns.ContainsKey(col))
+                    writer.WriteLine($"{col}: {columns[col]}");
+            }
+        }
+    }
+}

URLNotesGrabberCORE/Properties/launchSettings.json

@@ -2,7 +2,7 @@
   "profiles": {
     "URLNotesGrabberCORE": {
       "commandName": "Project",
-      "commandLineArgs": "-collect 1 -api4"
+      "commandLineArgs": "--collect 1 --api4"
     }
   }
 }

URLNotesGrabberCORE/ResponseNotes.cs

@@ -85,6 +85,10 @@ namespace URLNotesGrabberCORE
         public int retryInSeconds { get; set; }
 
         public string rawJson { get; set; }
+
+        // The request never reached the Tumblr API (transport error, or an edge/CDN response with a
+        // non-JSON body). Says nothing about the post, so the caller should retry rather than fail it.
+        public bool transientFailure { get; set; }
     }
 
     // Classes for Posts API endpoint (for reply_text)

URLNotesGrabberCORE/RevertMode.cs

@@ -0,0 +1,110 @@
+using Microsoft.Extensions.Configuration;
+
+namespace URLNotesGrabberCORE
+{
+    // Inverse of OutputMode. Recursively walks the PathInput tree (the same directory tree the
+    // no-parameter run uses) and restores every *.bak back to its *.txt, first preserving the
+    // current *.txt as the next-free *.bkN. Consumes the *.bak (File.Move). Filesystem-only;
+    // does not read the DB. An optional blogname argument filters by path substring.
+    public static class RevertMode
+    {
+        public static int Run(IConfiguration config, string? blogFilter = null)
+        {
+            string? root = config["appSettings:PathInput"];
+            if (string.IsNullOrWhiteSpace(root) || !Directory.Exists(root))
+            {
+                Console.WriteLine($"PathInput is not set or does not exist: '{root}'. Nothing to revert.");
+                return 0;
+            }
+
+            Console.WriteLine($"Searching for .bak files under: {root}");
+
+            // Recursively collect every *.bak, optionally filtered by path substring (blogname).
+            var bakFiles = EnumerateBakFiles(root)
+                .Where(f => string.IsNullOrWhiteSpace(blogFilter)
+                            || f.IndexOf(blogFilter, StringComparison.OrdinalIgnoreCase) >= 0)
+                .ToList();
+
+            if (bakFiles.Count == 0)
+            {
+                Console.WriteLine("No .bak files found. Nothing to revert.");
+                return 0;
+            }
+
+            Console.Write($"WARNING: This will restore {bakFiles.Count} .bak file(s) over their .txt files. " +
+                          $"Current .txt files are preserved as the next-free .bkN. Continue? (yes/no): ");
+            string? response = Console.ReadLine();
+            if (string.IsNullOrWhiteSpace(response) || !response.Equals("yes", StringComparison.OrdinalIgnoreCase))
+            {
+                Console.WriteLine("Operation cancelled.");
+                return 0;
+            }
+
+            int restored = 0, backedUp = 0;
+            foreach (var bakFile in bakFiles)
+            {
+                try
+                {
+                    string txtPath = Path.ChangeExtension(bakFile, ".txt");
+
+                    if (File.Exists(txtPath))
+                    {
+                        string bkPath = NextFreeBkPath(txtPath);
+                        File.Move(txtPath, bkPath);
+                        backedUp++;
+                        Console.WriteLine($"  Backed up {Path.GetFileName(txtPath)} -> {Path.GetFileName(bkPath)}");
+                    }
+
+                    File.Move(bakFile, txtPath);
+                    restored++;
+                    Console.WriteLine($"  Restored {bakFile} -> {Path.GetFileName(txtPath)}");
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"  Error reverting {bakFile}: {ex.Message}");
+                }
+            }
+
+            Console.WriteLine($"\nRevert mode complete. Restored {restored} file(s); backed up {backedUp} current .txt file(s).");
+            return 0;
+        }
+
+        // Recursively yields every *.bak path under root. Per-directory try/catch so an
+        // inaccessible folder doesn't abort the whole walk (mirrors TraverseDirectory).
+        private static IEnumerable<string> EnumerateBakFiles(string path)
+        {
+            string[] subDirs;
+            try { subDirs = Directory.GetDirectories(path); }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"  Skipping '{path}': {ex.Message}");
+                yield break;
+            }
+
+            foreach (var dir in subDirs)
+                foreach (var bak in EnumerateBakFiles(dir))
+                    yield return bak;
+
+            string[] bakFiles;
+            try { bakFiles = Directory.GetFiles(path, "*.bak"); }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"  Skipping files in '{path}': {ex.Message}");
+                yield break;
+            }
+
+            foreach (var bak in bakFiles)
+                yield return bak;
+        }
+
+        // Returns the lowest unused .bkN path for a given .txt file (.bk1, .bk2, ...).
+        private static string NextFreeBkPath(string txtFile)
+        {
+            for (int n = 1; ; n++)
+            {
+                string candidate = Path.ChangeExtension(txtFile, $".bk{n}");
+                if (!File.Exists(candidate)) return candidate;
+            }
+        }
+    }
+}

URLNotesGrabberCORE/TL.db.md

@@ -0,0 +1,679 @@
+# `TL.db` — schema notes
+
+The SQLite database behind **URLNotesGrabberCORE** and its sibling crawlers, and the one
+[Rolodex](https://git.basso.land/jim/Rolodex) reads.
+
+Everything below was read out of the live file, not inferred from code. Counts are as of
+**2026-08-07**; re-run the queries at the bottom to refresh them.
+
+- Journal mode: **WAL** — `TL.db-wal` and `TL.db-shm` live beside the file and are part of
+  the database. Copying `TL.db` alone gives you whatever was last checkpointed, not the
+  current state.
+- Page size: 4096. File size: 148 MB.
+
+> ### ⚠ Breaking change, 2026-08-07: `Notes` holds integer IDs, not names
+>
+> `Notes.RootBlogName`, `Notes.NoteBlogName` and `Notes.Type` **no longer exist**. They
+> are now `RootBlogId`, `NoteBlogId` and `TypeId`, resolved through the new `BlogNames`
+> and `NoteTypes` tables. Any query naming the old columns fails outright.
+>
+> There is no compatibility view. See [porting to the integer
+> schema](#porting-to-the-integer-schema) for the old-to-new translation of every query
+> shape the applications use.
+>
+> Applied by `../normalize-notes.sql`, which took the file from 207 MB to 148 MB. An
+> earlier change the same day (`../shrink-db.sql`) took it from 267 MB to 207 MB.
+
+---
+
+## The three content tables
+
+| Table | Rows | What it is |
+|---|--:|---|
+| `Blogs` | 188,620 | The crawl registry — one row per known blog, plus crawl-state flags |
+| `Posts` | 22,468 | Stored post content. Only 3,867 blogs actually have any |
+| `Notes` | 1,182,333 | The engagement graph: `NoteBlogId` acted on `(RootBlogId, PostID)` |
+
+…supported by two lookup tables that exist only to keep `Notes` small:
+
+| Table | Rows | What it is |
+|---|--:|---|
+| `BlogNames` | 20,430 | `BlogId` ⇄ `BlogName`. The ID authority for everything in `Notes` |
+| `NoteTypes` | 5 | `TypeId` ⇄ `Type`. `like`, `reblog`, `reply`, `posted`, `post_attribution` |
+
+The engagement graph is the interesting part. 20,311 distinct blogs appear as engagers —
+far more than the 3,867 that have stored posts — which is what makes this a social graph
+rather than a post archive. Only 2,771 blogs appear as the *root* of a note.
+
+### `Blogs`
+
+```sql
+CREATE TABLE "Blogs" (
+    "BlogName"              TEXT,
+    "HasBeenOutput"         INTEGER DEFAULT 0,
+    "IsActive"              INTEGER DEFAULT 1,
+    "DateAdded"             TEXT NOT NULL DEFAULT '12/24/25',
+    "ByLikes"               INTEGER NOT NULL DEFAULT 0,
+    "LikesPulled"           INTEGER NOT NULL DEFAULT 0,
+    "LikesCursor"           INTEGER DEFAULT 0,
+    "DateModified"          TEXT,
+    "DateCreated"           TEXT,
+    LikesNewestTimestamp    INTEGER DEFAULT 0,
+    LikesLastRefreshed      INTEGER DEFAULT 0,
+    LikesLastNewCount       INTEGER DEFAULT 0,
+    TTFolderPath            TEXT,
+    BlogId                  INTEGER,
+    PRIMARY KEY("BlogName")
+);
+
+CREATE INDEX ix_Blogs_BlogId ON Blogs (BlogId);
+```
+
+`BlogName` is the primary key, so it is the only indexed way in by name. There is no index
+on any flag or date — filtering or sorting on those scans all 188k rows, which is
+affordable here and is not on `Notes`.
+
+**`BlogId` is new as of 2026-08-07 and is the join key to `Notes`.** It exists so that
+`Notes` can reach `Blogs` in a single integer hop rather than going through `BlogNames`
+and ending in a text comparison:
+
+```sql
+-- what you want
+FROM Blogs B JOIN Notes N ON N.NoteBlogId = B.BlogId
+
+-- not this
+FROM Blogs B JOIN BlogNames BN ON BN.BlogName = B.BlogName
+             JOIN Notes N      ON N.NoteBlogId = BN.BlogId
+```
+
+**`BlogId` is NULL on 168,202 of 188,620 rows** — every blog that has never appeared in a
+note. That is the large majority, and it is not an error: the registry is far bigger than
+the engagement graph. An inner join on `BlogId` therefore silently drops those blogs,
+which is usually what you want for engagement queries and is wrong for registry listings.
+
+Flag distribution: `IsActive = 1` on 188,601 of 188,620 rows, `HasBeenOutput = 1` on
+5,059, `ByLikes = 1` on 2. `IsActive` carries a second meaning as of Rolodex — see
+[`Blogs.IsActive`](#blogsisactive--now-written-by-two-applications) below.
+
+The columns after `DateCreated` were added later by `ALTER TABLE`, which is why they carry
+no quoting in the stored DDL. That is the normal way this schema grows, and `BlogId` is
+the newest example.
+
+**`DateAdded` is not written consistently.** 170,677 rows hold ISO `yyyy-MM-dd HH:mm:ss`;
+17,943 hold US-format `M/d/yy` from a bulk import. As text those two sort into different
+parts of the table, so anything ordering or range-filtering on this column has to
+normalise first — see `DateSql` in Rolodex.
+
+### `Posts`
+
+```sql
+CREATE TABLE "Posts" (
+    "BlogName"              TEXT,
+    "PostID"                INTEGER,
+    "HasNotesGathered"      INTEGER DEFAULT 0,
+    "reblogURL"             TEXT,
+    "NotFound"              INTEGER DEFAULT 0,
+    "PostDate"              TEXT,
+    "NotesGatheredDateTime" INTEGER NOT NULL DEFAULT 1729746000,
+    "HasImage"              INTEGER NOT NULL DEFAULT 0,
+    "PostURL"               TEXT,
+    "Slug"                  TEXT,
+    "ReblogKey"             TEXT,
+    "ReblogName"            TEXT,
+    "Summary"               TEXT,
+    "Quote"                 TEXT,
+    "Body"                  TEXT,
+    "Tags"                  TEXT,
+    "Link"                  TEXT,
+    "PhotoURL"              TEXT,
+    "PhotoCaption"          TEXT,
+    "DownloadedFiles"       TEXT,
+    "AudioCaption"          TEXT,
+    "Question"              TEXT,
+    "Answer"                TEXT,
+    "Title"                 TEXT,
+    "ByLikes"               INTEGER NOT NULL DEFAULT 0,
+    "RootBlogName"          TEXT,
+    "RootURL"               TEXT,
+    "DateModified"          TEXT,
+    "DateCreated"           TEXT,
+    PostType                TEXT,
+    PRIMARY KEY("BlogName","PostID")
+);
+```
+
+**The key is `(BlogName, PostID)`, not `PostID`.** This matters more than it looks: 345
+post IDs exist under more than one blog, so an ID on its own is both ambiguous *and*
+unindexed. Any lookup should carry the blog name, and a batch lookup should group by blog
+so it stays on the leading column of the key.
+
+Notable:
+
+- **`PostType` is now mostly populated: 20,679 of 22,468 rows, leaving 1,789 `NULL`.**
+  This reverses what earlier revisions of this document said — the column really was empty
+  on every row, and something has since started writing it. Anything that treated it as
+  permanently unset, or derived the type from post content instead, should be re-examined
+  against the live data. Rolodex still derives it.
+- `HasImage = 1` on 14,026 rows. It records that the post *had* a picture, not that a
+  usable URL was kept, so it is not a reliable predictor that anything will render.
+- `PhotoURL` is largely unused; in practice the image markup lives inside `Body`.
+- `NotFound = 1` on 4,712 rows — posts that have since been deleted upstream.
+- The content columns (`Body`, `Quote`, `Question`, `Answer`, …) are the heavy ones. List
+  views should not select them.
+
+### `Notes`
+
+```sql
+CREATE TABLE Notes (
+    RootBlogId      INTEGER NOT NULL,
+    PostID          INTEGER NOT NULL,
+    NoteBlogId      INTEGER NOT NULL,
+    TimeStamp       INTEGER NOT NULL,
+    TypeId          INTEGER NOT NULL,
+    replyText       TEXT,
+    DatetimeCrawled TEXT,
+    DateModified    TEXT,
+    DateCreated     TEXT,
+    IsActive        INTEGER NOT NULL DEFAULT 1,
+    PRIMARY KEY (RootBlogId, PostID, TimeStamp, TypeId, NoteBlogId)
+) WITHOUT ROWID;
+
+CREATE INDEX ix_Notes_NoteBlogId ON Notes (NoteBlogId);
+```
+
+**Integer IDs since 2026-08-07 — this is the breaking change.** `RootBlogName`,
+`NoteBlogName` and `Type` are gone, replaced by `RootBlogId`, `NoteBlogId` and `TypeId`.
+Resolve them through [`BlogNames`](#blognames) and [`NoteTypes`](#notetypes), or join
+straight to `Blogs` on `BlogId`. The old names were text repeated on 1.18 million rows,
+in the table *and* in every index over it; the swap took the file from 207 MB to 148 MB.
+
+The **primary key column order is deliberately unchanged**, so the leading-prefix access
+patterns callers already depend on still hold: `(RootBlogId)` and `(RootBlogId, PostID)`
+remain cheap prefixes, exactly as `(RootBlogName)` and `(RootBlogName, PostID)` were.
+
+Two nulls-and-defaults differences from the old DDL, both intentional:
+
+- `replyText` and `DatetimeCrawled` **no longer carry column defaults**. The old table
+  defaulted them to `'.'` and `'2/12/26 12am'`, which is how 1.1M rows acquired
+  placeholder values nobody wrote. New rows now get `NULL` unless a writer supplies
+  something. The crawler names both columns explicitly, so its behaviour is unchanged.
+- The five key columns are now `NOT NULL`. They always were in practice.
+
+**`WITHOUT ROWID`, since earlier the same day.** The rows live in the primary key's
+b-tree rather than in a rowid table with a separate key index beside it. Two consequences
+matter before adding an index here:
+
+- There is no `rowid` on this table. `SELECT rowid FROM Notes` is an error, and no
+  code in any of the three apps relied on it.
+- A secondary index carries the whole five-column primary key as its row reference
+  instead of a compact rowid, so indexes here are **expensive** — though far less so
+  than before, now that the key is five integers rather than three integers and two
+  strings. `ix_Notes_NoteBlogId` costs 27 MB; its text predecessor cost 58 MB.
+
+**`Notes_idx_06e01ae3` on `TimeStamp DESC` was dropped at the same time.** It cost
+14 MB as a rowid index and would have cost 58 MB after the conversion. It was worth
+neither: the crawler's only `TimeStamp` filter (`>= 1535778000`) excludes 786 rows
+of 1.18M, Rolodex's default Notes sort carries a three-column tiebreaker that forces
+a full sort regardless, and the reply-matching `UPDATE` uses `ABS(TimeStamp - ?) <= 5`,
+which no index on `TimeStamp` can serve. The one path that got slower is Rolodex's
+Notes page with a date-range filter: 60 ms to 164 ms.
+
+See `../shrink-db.sql` for the full rationale and the applied result.
+
+**`DatetimeCrawled` is `NULL` on 1,148,077 rows, and that is the honest value.** Those
+rows previously stored the literal string `'2/12/26 12am'` — this column's own DDL
+default, written as a bulk backfill placeholder rather than as a crawl time. They were
+set to `NULL` on 2026-08-07, which is what consumers already displayed them as: the
+string parses as a date in neither format this schema writes.
+
+Note the trap: **the `DEFAULT '2/12/26 12am'` clause is still in the DDL above.** Any
+`INSERT` that omits this column writes the placeholder straight back. The crawler names
+it explicitly on every insert, so nothing reintroduces it today, but a new writer that
+forgets to would — which is why consumers should keep treating an unparseable value here
+as "unknown" rather than assuming `NULL` is now the only such marker.
+
+One row per engagement event. `TimeStamp` is **unix seconds** — unlike every date column
+elsewhere in the schema, which are text.
+
+At 1.18M rows this is the table that dictates how the whole database has to be queried:
+
+- **Nothing should run an unbounded `SELECT` or a bare `COUNT(*)` here.** A count scans
+  the lot on every call.
+- The only fast access paths are the primary key's leading columns (`RootBlogId`, then
+  `PostID`) and `ix_Notes_NoteBlogId` on `NoteBlogId`. "Notes received by a blog" and
+  "notes given by a blog" are both cheap; almost nothing else is.
+- **Every** ordering here is a full sort of whatever the filters leave, `TimeStamp`
+  included. Filter first, then sort.
+- `replyText` is `'.'` on 1,167,464 rows — only `reply` notes carry real text. Those
+  dots are inherited from the old column default; new rows get `NULL` instead.
+
+**Resolve IDs by filtering the lookup, not by scanning `Notes`.** The lookup tables are
+tiny and uniquely indexed, so pushing a name predicate into them costs nothing and lets
+the `Notes` index do the work:
+
+```sql
+-- good: BlogNames resolves the name, then the index is searched
+SELECT * FROM Notes
+ WHERE NoteBlogId = (SELECT BlogId FROM BlogNames WHERE BlogName = ?);
+
+-- also good, same plan
+SELECT n.* FROM Notes n
+  JOIN BlogNames b ON b.BlogId = n.NoteBlogId
+ WHERE b.BlogName = ?;
+```
+
+### `BlogNames`
+
+```sql
+CREATE TABLE BlogNames (
+    BlogId   INTEGER PRIMARY KEY,
+    BlogName TEXT NOT NULL UNIQUE
+);
+```
+
+20,430 rows — every name appearing in `Notes` as either participant, and nothing else.
+This is the **ID authority**: `Notes.RootBlogId` and `Notes.NoteBlogId` both point here,
+and `Blogs.BlogId` is a copy of the value for the blogs that have one.
+
+**12 of these names have no `Blogs` row.** The registry has never been a superset of the
+engagement graph and still is not, so resolving an ID through `Blogs` rather than
+`BlogNames` will occasionally find nothing. Use `BlogNames` when you need the name itself
+and `Blogs` when you need registry columns.
+
+IDs are assigned by SQLite and are **stable**: they are stored in over a million `Notes`
+rows. Never renumber them. A blog that is renamed upstream should get a new row, not an
+edit to an existing one, unless every `Notes` reference is migrated with it.
+
+### `NoteTypes`
+
+```sql
+CREATE TABLE NoteTypes (
+    TypeId INTEGER PRIMARY KEY,
+    Type   TEXT NOT NULL UNIQUE
+);
+```
+
+| `TypeId` | `Type` | Rows | Share |
+|--:|---|--:|--:|
+| 1 | `like` | 945,167 | 79.9% |
+| 2 | `reblog` | 219,203 | 18.5% |
+| 3 | `reply` | 15,345 | 1.3% |
+| 4 | `posted` | 2,617 | 0.2% |
+| 5 | `post_attribution` | 1 | — |
+
+The set is fixed in practice, but it is a table rather than a `CHECK` constraint so that
+adding a type is an `INSERT` and not a schema migration. **The IDs above are stored in
+`Notes` and must not be reassigned.**
+
+Five rows means the lookup is effectively free; write `t.Type = 'reblog'` and let SQLite
+resolve it, or hardcode the ID if you prefer — both are fine, but hardcoding ties your
+code to this table's contents, so prefer the join in anything long-lived.
+
+---
+
+## Porting to the integer schema
+
+Everything here was checked against the live 148 MB file. There were 14 affected call
+sites in `DataAccess.cs` and 16 in `RolodexRepository.cs`. TumblThree needs no changes —
+its single statement touches `Blogs.IsActive` and `BlogName` only.
+
+**`DataAccess.cs` is ported.** All 14 sites now read the integer schema, `AddNote`
+registers names and types before inserting, and `verify-db-schema.sql` reports a
+pre-migration file rather than letting the app fail on it. `RolodexRepository.cs` lives in
+the [Rolodex](https://git.basso.land/jim/Rolodex) repository and is not covered by that
+work. One site was dropped rather than translated: the `LEFT JOIN Notes` in `GetPosts`
+selected nothing and was collapsed by the query's own `GROUP BY`, so it could not affect
+the result.
+
+### Column mapping
+
+| Was | Is now | Resolve via |
+|---|---|---|
+| `Notes.RootBlogName` | `Notes.RootBlogId` | `BlogNames.BlogId` → `.BlogName` |
+| `Notes.NoteBlogName` | `Notes.NoteBlogId` | `BlogNames.BlogId` → `.BlogName` |
+| `Notes.Type` | `Notes.TypeId` | `NoteTypes.TypeId` → `.Type` |
+| `ix_NoteBlogName01` | `ix_Notes_NoteBlogId` | — |
+
+`PostID`, `TimeStamp`, `replyText`, `DatetimeCrawled`, `DateModified`, `DateCreated` and
+`IsActive` are unchanged.
+
+### Filtering by a blog name
+
+```sql
+-- was
+WHERE NoteBlogName = @Name
+
+-- now, either form; both search ix_Notes_NoteBlogId after a unique-index lookup
+WHERE NoteBlogId = (SELECT BlogId FROM BlogNames WHERE BlogName = @Name)
+-- or
+JOIN BlogNames b ON b.BlogId = n.NoteBlogId WHERE b.BlogName = @Name
+```
+
+Measured 73 ms against 63 ms for the old text form on the busiest blog — the extra hop is
+a unique-index probe on a 20k-row table and does not show.
+
+### Joining `Notes` to `Blogs`
+
+This is the join to get right; it is the most common shape in both applications.
+
+```sql
+-- was
+FROM Blogs B INNER JOIN Notes N ON N.NoteBlogName = B.BlogName
+
+-- now: one integer hop, using the new Blogs.BlogId
+FROM Blogs B INNER JOIN Notes N ON N.NoteBlogId = B.BlogId
+```
+
+Do **not** route this through `BlogNames` — that adds a hop and ends in the text
+comparison the change was meant to remove.
+
+### Selecting a name back out
+
+```sql
+-- was
+SELECT NoteBlogName AS blogName, COUNT(*) FROM Notes ... GROUP BY NoteBlogName
+
+-- now
+SELECT bn.BlogName AS blogName, COUNT(*)
+  FROM Notes n JOIN BlogNames bn ON bn.BlogId = n.NoteBlogId
+ ... GROUP BY bn.BlogName
+```
+
+Group by `n.NoteBlogId` instead of `bn.BlogName` when you only need the name for display —
+grouping on the integer is cheaper and the name comes along for free.
+
+### Filtering by type
+
+```sql
+-- was
+WHERE type IN ('reblog', 'reply', 'posted')
+
+-- now
+WHERE TypeId IN (SELECT TypeId FROM NoteTypes WHERE Type IN ('reblog','reply','posted'))
+-- or, equivalently
+JOIN NoteTypes t ON t.TypeId = n.TypeId WHERE t.Type IN ('reblog','reply','posted')
+```
+
+`WHERE TypeId IN (2,3,4)` also works and is marginally faster, but hardcodes this table's
+contents into application code. Prefer the lookup outside of hot paths.
+
+Note the negated form needs care: `type NOT IN ('reblog','reply','posted')` becomes
+`TypeId NOT IN (SELECT TypeId FROM NoteTypes WHERE Type IN (...))`, which is correct only
+because `TypeId` is `NOT NULL`.
+
+### Inserting a note
+
+The crawler must ensure both names have IDs first. `INSERT OR IGNORE` on `BlogNames` is
+the whole of it — no read-back, no round trip, safe to run every time:
+
+```sql
+INSERT OR IGNORE INTO BlogNames (BlogName) VALUES (@rootBlogName);
+INSERT OR IGNORE INTO BlogNames (BlogName) VALUES (@noteBlogName);
+
+INSERT OR IGNORE INTO Notes
+       (RootBlogId, PostID, NoteBlogId, TimeStamp, TypeId,
+        DatetimeCrawled, DateModified, DateCreated)
+SELECT (SELECT BlogId FROM BlogNames WHERE BlogName = @rootBlogName),
+       @PostID,
+       (SELECT BlogId FROM BlogNames WHERE BlogName = @noteBlogName),
+       @TimeStamp,
+       (SELECT TypeId FROM NoteTypes WHERE Type = @Type),
+       @DatetimeCrawled, @DateModified, @DateCreated;
+```
+
+Verified: a genuinely new note inserts, and re-running the identical statement inserts 0.
+Run all three statements in one transaction so a crash cannot leave a name registered
+with no note.
+
+**The duplicate-key error message has changed.** `DataAccess.cs` compares against the
+literal string
+
+```
+UNIQUE constraint failed: Notes.RootBlogName, Notes.PostID, Notes.TimeStamp, Notes.Type, Notes.NoteBlogName
+```
+
+at two call sites to decide whether to swallow an exception. SQLite now emits the *new*
+column names, so those comparisons no longer match and real errors will surface where
+they used to be silently ignored — or vice versa.
+
+Both sites now go through `IsNotesDuplicateKey` in `DataAccess.cs`, which matches on
+`UNIQUE constraint failed` plus `Notes.` rather than on the column list. A literal
+comparison is what broke here; the next rename should not break it again.
+
+### Updating notes
+
+Predicates translate the same way. The reply-matching update, which cannot use an index
+on `TimeStamp` either before or after:
+
+```sql
+-- now
+UPDATE Notes SET replyText = @replyText, DateModified = @dateModified
+ WHERE NoteBlogId = (SELECT BlogId FROM BlogNames WHERE BlogName = @noteBlogName)
+   AND ABS(TimeStamp - @TimeStamp) <= 5
+   AND TypeId = (SELECT TypeId FROM NoteTypes WHERE Type = 'reply')
+   AND (replyText IS NULL OR replyText = '' OR replyText = '.')
+   AND (replyText IS NULL OR replyText <> @replyText);
+```
+
+Rolodex's soft-delete updates need no change beyond the `WHERE` clause — they set
+`IsActive`, which is untouched.
+
+### Three traps
+
+**`Blogs.BlogId` is NULL on 168,202 of 188,620 rows.** Any inner join on it silently drops
+every blog that has never appeared in a note. Correct for engagement queries; wrong for
+registry listings, which need a `LEFT JOIN` or no join at all.
+
+**12 names in `BlogNames` have no `Blogs` row.** Resolving an ID to a name through `Blogs`
+will occasionally find nothing. Use `BlogNames` for names and `Blogs` for registry columns.
+
+**IDs are stable and must stay so.** `BlogNames.BlogId` and `NoteTypes.TypeId` are stored
+in over a million `Notes` rows. Never renumber. A blog renamed upstream gets a new row,
+not an edited one, unless every `Notes` reference migrates with it.
+
+---
+
+### Referential integrity
+
+There are no foreign keys, and the tables do not perfectly agree:
+
+- 4 `Posts` rows name a blog with no `Blogs` row.
+- 12 of the 20,430 names in `BlogNames` have no `Blogs` row.
+
+So a name appearing in `Notes` or `Posts` is not a guarantee that the registry knows about
+it. Joins from those tables back to `Blogs` should tolerate a miss.
+
+The integer schema does not fix this and was not meant to. `BlogNames` is deliberately
+built from `Notes` rather than from `Blogs`, precisely so that the 12 unregistered
+engagers keep their IDs and their rows. Had it been built from the registry, those notes
+would have been dropped by the migration's inner joins.
+
+---
+
+## The `'.'` placeholder convention
+
+**The crawler writes a single dot into text columns it has no value for, rather than
+`NULL`.** This is the single most surprising thing about the schema and it affects every
+consumer.
+
+| Column | `'.'` rows |
+|---|--:|
+| `Notes.replyText` | 1,167,464 |
+| `Posts.Title` | 12,562 |
+| `Posts.Body` | 172 |
+
+`Notes.replyText` and `Notes.DatetimeCrawled` **no longer carry column defaults** as of
+the integer migration, so new note rows get `NULL` rather than a placeholder. The dots
+already in `replyText` were not rewritten — cleaning is still required on read.
+
+Any query whose output reaches a human should collapse it:
+
+```sql
+NULLIF(NULLIF(SomeColumn, '.'), '') AS SomeColumn
+```
+
+Empty string turns up too, hence the double `NULLIF`. Not every column is affected —
+`Blogs.TTFolderPath` and `Blogs.DateModified` currently have zero dot rows — but new
+columns tend to acquire them, so treat cleaning as the default for any text column
+rendered to a user.
+
+---
+
+## Supporting tables
+
+Crawler bookkeeping. Rolodex ignores all of these.
+
+| Table | Rows | What it is |
+|---|--:|---|
+| `DailyAPICount` | 133 | `(Date TEXT PK, APICount INTEGER)` — per-day API call tally against the rate limit |
+| `ApiKeyPoolState` | 2 | `(KeyName TEXT PK, RetryUntil INTEGER)` — per-key backoff; `RetryUntil` is unix seconds |
+| `ApiKeyPoolMeta` | 1 | `(Id PK CHECK (Id = 1), LastIndex)` — round-robin cursor. Singleton by check constraint |
+| `CollectRunState` | 1 | `(Id PK CHECK (Id = 1), RunCutoff, RunComplete, RunStarted, RunCompletedAt)` — resume state for an interrupted collection run. Also a singleton |
+
+---
+
+## `Blogs.IsActive` — now written by two applications
+
+`IsActive` has always been the crawler's work-selection flag. `GetBlogs` in
+`DataAccess.cs` joins on it to decide what to collect:
+
+```sql
+-- shape only; the ported GetBlogs joins Blogs directly on BlogId and needs no BlogNames hop
+SELECT bn.BlogName, count(*)
+  FROM Notes n
+  JOIN Blogs     b  ON b.BlogId  = n.NoteBlogId
+  JOIN BlogNames bn ON bn.BlogId = n.NoteBlogId
+ WHERE b.IsActive = @isActive AND ...
+```
+
+Nothing inside the crawler *writes* it — it is an input, set from outside.
+
+**Rolodex is now one of the things that sets it.** Removing a blog through the Rolodex UI
+runs exactly this:
+
+```sql
+UPDATE Blogs SET IsActive = 0 WHERE BlogName = ?;
+```
+
+Rolodex adds no column and changes no schema. It reuses this flag because the two meanings
+were judged to be one decision: a blog you do not want in the browsing UI is a blog you do
+not want to keep crawling. Removal therefore stops collection, and the Rolodex
+confirmation screen says so before anyone commits.
+
+- `1` (or absent/NULL) — live. Crawled, and visible in Rolodex.
+- `0` — removed. Not crawled, hidden from the Rolodex registry, dashboard counts and
+  engagement rollups.
+
+Restoring is the same `UPDATE` with a `1`. Nothing is destroyed either way: the blog's
+`Posts` and `Notes` rows are never touched, and Rolodex deliberately keeps showing them
+under its Posts and Notes pages. Removing a blog hides the blog, not what it collected.
+
+### What other tools need to know
+
+1. **Setting `IsActive = 0` now also hides the blog from Rolodex**, and setting it back to
+   `1` makes it reappear. If another tool deactivates blogs in bulk, it is also removing
+   them from the browsing UI — which may be exactly right, but it is no longer a
+   crawler-only decision.
+2. **Re-crawling a removed blog will not bring it back**, since nothing in the crawler
+   writes the flag. An `INSERT OR REPLACE` on the `Blogs` row *would*, by resetting it to
+   the column default of `1`. Prefer an `UPDATE` of the specific columns, or
+   `INSERT … ON CONFLICT DO UPDATE SET` naming only the columns being refreshed.
+3. **NULL is treated as live.** The column is `INTEGER DEFAULT 1` with no `NOT NULL`, so
+   Rolodex reads it through `COALESCE(IsActive, 1)`. A NULL therefore leaves the blog
+   visible rather than stranding it outside both the registry and the removed list, where
+   no screen could reach it. Write `0` or `1`, not NULL.
+4. **Backing the feature out is a configuration change, not a migration.** Because there is
+   no Rolodex-owned column, setting `Rolodex__EnableBlogDeletion=false` is the whole of it;
+   there is nothing to drop. Any blogs already at `IsActive = 0` simply go back to being
+   ordinary inactive blogs.
+
+---
+
+## `Posts.IsActive` and `Notes.IsActive` — present, and written from outside
+
+The same flag extends to the two content tables, with the same meaning: `0` is removed,
+anything else — including `NULL` — is live. **Both columns now exist in the live `TL.db`**
+and are included in the DDL quoted above. As of 2026-08-07, `Posts.IsActive = 0` on 5,900
+rows and `Notes.IsActive = 0` on none. Like `Blogs.IsActive`, they are written from
+outside this crawler.
+
+On `Notes` the column is `INTEGER NOT NULL DEFAULT 1`, so a `NULL` cannot occur there;
+`Posts` and `Blogs` are laxer, which is why the predicate below still uses `COALESCE`.
+
+The crawler therefore treats both as optional, and as nothing it owns:
+
+- **It never writes them.** No `INSERT` column list names `IsActive`, no `UPDATE` sets it,
+  and `MapPrefixToColumn` — the only place a column name is chosen at runtime — cannot map
+  to it. Re-crawling a removed post or note refreshes its content and leaves the flag at
+  `0`. There is no `INSERT OR REPLACE` on `Posts` or `Notes` for a default to be reset by.
+- **It filters on them only when they exist.** `HasIsActiveColumn` in `DataAccess.cs` asks
+  `PRAGMA table_info` once per table per database path and caches the answer; the filter
+  is `COALESCE(IsActive, 1) = 1`, and it is dropped entirely when the column is absent.
+  Naming a missing column is a hard SQLite error, so this is what lets one build run
+  against databases on both sides of the change. The cache lives for the process — adding
+  the columns to a live database takes effect on the next run.
+
+Every read that selects posts or notes carries the filter: `GetPosts`, `GetReplies`,
+`GetRepliesWithMissingText`, `GetRepliesWithFilledText`, `GetAllPostTextColumns`,
+`GetAllPostsForBlog`, `GetPost`, `GetPostByIdAnyBlog`, and the engagement queries that
+count or join `Notes` (`GetBlogs`, `GetBlogsAll`, `GetBlogsForLikes`). The one deliberate
+omission is the `LEFT JOIN Notes` in `GetPosts`: nothing is selected from it and it can
+neither add nor remove a row, so filtering it would buy nothing.
+
+`LegacyPostsDbImporter` is unfiltered too — it reads a foreign legacy database whose
+`Posts` table is not this schema.
+
+Two consequences worth stating plainly, both inherited from how `Blogs.IsActive` is
+handled:
+
+1. **Removal hides a row; it does not freeze it.** The write paths are keyed on a post the
+   caller already selected, so an ingest or a correction run still overwrites the content
+   of a removed post. Only selection is filtered.
+2. **`NULL` is live.** Write `0` or `1`, not `NULL`, but a `NULL` leaves the row visible
+   rather than stranding it.
+
+---
+
+## Reproducing the numbers
+
+```sql
+SELECT 'Blogs', COUNT(*) FROM Blogs
+UNION ALL SELECT 'Posts',     COUNT(*) FROM Posts
+UNION ALL SELECT 'Notes',     COUNT(*) FROM Notes
+UNION ALL SELECT 'BlogNames', COUNT(*) FROM BlogNames;
+
+-- note type mix (joins NoteTypes; Notes.Type no longer exists)
+SELECT t.Type, COUNT(*)
+  FROM Notes n JOIN NoteTypes t ON t.TypeId = n.TypeId
+ GROUP BY t.Type ORDER BY 2 DESC;
+
+-- how much of the registry participates in the engagement graph
+SELECT COUNT(*) FILTER (WHERE BlogId IS NOT NULL) AS with_notes,
+       COUNT(*) FILTER (WHERE BlogId IS NULL)     AS without_notes
+  FROM Blogs;
+
+-- the two date shapes in Blogs.DateAdded
+SELECT CASE WHEN DateAdded LIKE '____-__-__%' THEN 'ISO' ELSE 'US' END, COUNT(*)
+FROM Blogs GROUP BY 1;
+
+-- post IDs that are ambiguous without a blog name
+SELECT COUNT(*) FROM (
+    SELECT PostID FROM Posts GROUP BY PostID HAVING COUNT(DISTINCT BlogName) > 1);
+
+-- rows that reference a blog the registry does not have
+SELECT COUNT(*) FROM Posts p
+WHERE NOT EXISTS (SELECT 1 FROM Blogs b WHERE b.BlogName = p.BlogName);
+
+SELECT COUNT(*) FROM BlogNames bn
+WHERE NOT EXISTS (SELECT 1 FROM Blogs b WHERE b.BlogName = bn.BlogName);
+
+-- space by object, to see where the file actually goes
+SELECT name, SUM(pgsize)/1024/1024 AS mb
+  FROM dbstat GROUP BY name ORDER BY SUM(pgsize) DESC;
+```
+
+Open the file read-only so an inspection can never disturb a running crawl:
+
+```bash
+sqlite3 "file:TL.db?mode=ro" ".schema"
+```

URLNotesGrabberCORE/URLNotesGrabberCORE.csproj

@@ -29,6 +29,9 @@
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
     <None Update="TL.db">
+      <CopyToOutputDirectory>Never</CopyToOutputDirectory>
+    </None>
+    <None Update="prefixes.txt">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
   </ItemGroup>

URLNotesGrabberCORE/UpdateBlogPathsRunner.cs

@@ -0,0 +1,164 @@
+using System.Text.Json;
+
+namespace URLNotesGrabberCORE
+{
+    // Port of ThreeTxtFileHelper/UpdateBlogPaths.cs. Reads .tumblr / .tmblrpriv metadata
+    // files from a root\Index folder and populates Blogs.TTFolderPath in TL.db.
+    //
+    // Scan() is the reusable engine: --updatepaths wraps it as a standalone command and
+    // --output calls it as a refresh step, because a TL.db synced between machines cannot
+    // hold one absolute path that is correct on both.
+    public static class UpdateBlogPathsRunner
+    {
+        public enum ScanOutcome
+        {
+            Completed,
+            NoRootConfigured,
+            IndexFolderMissing
+        }
+
+        public sealed class ScanResult
+        {
+            public ScanOutcome Outcome { get; init; }
+            public string RootPath { get; init; } = string.Empty;
+            public string IndexPath { get; init; } = string.Empty;
+            public int MetadataFiles { get; init; }
+            public int Written { get; init; }
+            public int Unchanged { get; init; }
+            public int NoLocation { get; init; }
+            public int NoMatchingRow { get; init; }
+            public int Errors { get; init; }
+        }
+
+        // verbose: log a line per metadata file. --updatepaths wants that detail; --output
+        // only wants the counts, since a few hundred lines before the export would bury it.
+        public static ScanResult Scan(string? rootPath, bool verbose)
+        {
+            if (string.IsNullOrWhiteSpace(rootPath))
+                return new ScanResult { Outcome = ScanOutcome.NoRootConfigured };
+
+            DataAccess.EnsureTTFileHelperColumnsExist();
+
+            string indexPath = Path.Combine(rootPath, "Index");
+            if (!Directory.Exists(indexPath))
+            {
+                return new ScanResult
+                {
+                    Outcome = ScanOutcome.IndexFolderMissing,
+                    RootPath = rootPath,
+                    IndexPath = indexPath
+                };
+            }
+
+            var blogFiles = Directory.GetFiles(indexPath, "*.tumblr")
+                .Concat(Directory.GetFiles(indexPath, "*.tmblrpriv"))
+                .ToList();
+
+            if (verbose)
+                Console.WriteLine($"Found {blogFiles.Count} blog metadata files");
+
+            int updatedCount = 0;
+            int unchangedCount = 0;
+            int noLocationCount = 0;
+            int noRowCount = 0;
+            int errorCount = 0;
+
+            foreach (var blogFile in blogFiles)
+            {
+                try
+                {
+                    string blogName = Path.GetFileNameWithoutExtension(blogFile);
+                    string jsonContent = File.ReadAllText(blogFile);
+                    using JsonDocument doc = JsonDocument.Parse(jsonContent);
+                    JsonElement root = doc.RootElement;
+
+                    if (root.TryGetProperty("FileDownloadLocation", out JsonElement locationElement))
+                    {
+                        string? fileDownloadLocation = locationElement.GetString()?.Trim();
+                        if (!string.IsNullOrWhiteSpace(fileDownloadLocation))
+                        {
+                            // Report the database's answer, not the fact that the file parsed.
+                            if (DataAccess.SetBlogTTFolderPath(blogName, fileDownloadLocation))
+                            {
+                                updatedCount++;
+                                if (verbose)
+                                    Console.WriteLine($"Updated {blogName}: {fileDownloadLocation}");
+                            }
+                            else if (DataAccess.BlogExists(blogName))
+                            {
+                                unchangedCount++;
+                            }
+                            else
+                            {
+                                noRowCount++;
+                                Console.WriteLine($"No Blogs row named '{blogName}' -- path not stored (name may differ in case)");
+                            }
+                        }
+                        else
+                        {
+                            noLocationCount++;
+                            if (verbose)
+                                Console.WriteLine($"Empty FileDownloadLocation in {blogFile}");
+                        }
+                    }
+                    else
+                    {
+                        noLocationCount++;
+                        if (verbose)
+                            Console.WriteLine($"No FileDownloadLocation found in {blogFile}");
+                    }
+                }
+                catch (Exception ex)
+                {
+                    errorCount++;
+                    Console.WriteLine($"Error processing {blogFile}: {ex.Message}");
+                }
+            }
+
+            return new ScanResult
+            {
+                Outcome = ScanOutcome.Completed,
+                RootPath = rootPath,
+                IndexPath = indexPath,
+                MetadataFiles = blogFiles.Count,
+                Written = updatedCount,
+                Unchanged = unchangedCount,
+                NoLocation = noLocationCount,
+                NoMatchingRow = noRowCount,
+                Errors = errorCount
+            };
+        }
+
+        public static int Run(string rootPath)
+        {
+            if (string.IsNullOrWhiteSpace(rootPath))
+            {
+                Console.WriteLine("UpdateBlogPaths: rootPath is required.");
+                return 1;
+            }
+
+            string indexPath = Path.Combine(rootPath, "Index");
+            Console.WriteLine($"Scanning Index folder: {indexPath}");
+
+            var result = Scan(rootPath, verbose: true);
+
+            if (result.Outcome == ScanOutcome.IndexFolderMissing)
+            {
+                Console.WriteLine($"Index folder not found at: {result.IndexPath}");
+                return 1;
+            }
+
+            Console.WriteLine($"\n========== UpdateBlogPaths summary ==========");
+            Console.WriteLine($"Metadata files:           {result.MetadataFiles}");
+            Console.WriteLine($"TTFolderPath written:     {result.Written}");
+            Console.WriteLine($"Already correct:          {result.Unchanged}");
+            Console.WriteLine($"No FileDownloadLocation:  {result.NoLocation}");
+            Console.WriteLine($"No matching blog row:     {result.NoMatchingRow}");
+            Console.WriteLine($"Errors:                   {result.Errors}");
+
+            Console.WriteLine($"\nBlogs now holding a TTFolderPath: {DataAccess.CountBlogsWithTTFolderPath()}");
+
+            return result.Errors == 0 ? 0 : 2;
+        }
+    }
+}

URLNotesGrabberCORE/appsettings.json

@@ -11,7 +11,13 @@
     "ContainsList": "zombaee,zomb-eh,ahzombae,thebugandme,lovingbabybug,h4rdspot",
     "PostIDToExclude": "730084470076686336,726309940037287936,639974102120235008,184045126218",
     "EnableFileLogging": false,
-    "LogTraversalRecordImports": false
+    "LogTraversalRecordImports": false,
+    "LikesRefreshCooldownDays": 7,
+    "PathTTRoot": "",
+    "PathTTBackup": "",
+    "PathPrefixes": "prefixes.txt",
+    "PathCorrectionReport": "correction_report.txt",
+    "PathCorrectionApplied": "correction_applied.txt"
   },
   "TumblrApi": {
     "ConsumerKey": "PtsBCGumcsgihyynxUh8b47Jfmi7uXhEIOU46bmhdsUSJ5mEP3",

URLNotesGrabberCORE/prefixes.txt

@@ -0,0 +1,20 @@
+Post ID
+reblog URL
+Date
+Has Image
+Post URL
+Slug
+Reblog Key
+Reblog Name
+Summary
+Quote
+Body
+Tags
+Link
+Photo URL
+Photo Caption
+Downloaded Files
+Audio Caption
+Question
+Answer
+Title

normalize-notes.sql

@@ -0,0 +1,143 @@
+-- normalize-notes.sql
+-- Replaces the repeated blog-name and type TEXT in Notes with integer IDs.
+-- Reduces TL.db from ~207 MB to ~148 MB (-29%).
+--
+-- THIS IS A BREAKING SCHEMA CHANGE. There is no compatibility layer. Every
+-- query in URLNotesGrabberCORE and Rolodex that names Notes.RootBlogName,
+-- Notes.NoteBlogName or Notes.Type stops working the moment this runs, and
+-- stays broken until those queries are rewritten. This was a deliberate choice
+-- over a view-plus-triggers shim, which was measured to work but cost 194 ms ->
+-- 321 ms on Rolodex's unfiltered Notes page.
+--
+-- TumblThree is unaffected. It touches only Blogs, and the column added to
+-- Blogs here is additive.
+--
+-- HOW TO RUN (DB Browser for SQLite):
+--   1. Stop all three apps. Pause NextCloud sync.
+--   2. Back up TL.db.
+--   3. Execute SQL, paste this file, run. Then Write Changes.
+--   4. Tools > Compact Database (VACUUM). Nothing shrinks until this finishes.
+
+--------------------------------------------------------------------------
+-- The shape this produces
+--------------------------------------------------------------------------
+--   BlogNames(BlogId, BlogName)   the ID authority: every name appearing in
+--                                 Notes as either participant. 20,430 rows.
+--                                 12 of these have no Blogs row -- the
+--                                 registry has never been a superset of the
+--                                 engagement graph, and still is not.
+--
+--   NoteTypes(TypeId, Type)       5 rows. Fixed set, but written as a table
+--                                 rather than a CHECK so a new type is an
+--                                 INSERT and not a schema migration.
+--
+--   Notes(...Id columns...)       integer FKs in place of text. WITHOUT ROWID,
+--                                 same 5-column key in the same column order.
+--
+--   Blogs.BlogId                  NEW additive column. Lets Notes join Blogs in
+--                                 one integer hop instead of going through
+--                                 BlogNames and comparing text at the end.
+--                                 NULL on the 168,202 blogs with no notes.
+
+PRAGMA foreign_keys = off;
+
+BEGIN;
+
+--------------------------------------------------------------------------
+-- STEP 1: the ID authority
+--------------------------------------------------------------------------
+CREATE TABLE BlogNames (
+    BlogId   INTEGER PRIMARY KEY,
+    BlogName TEXT NOT NULL UNIQUE
+);
+
+INSERT INTO BlogNames (BlogName)
+    SELECT RootBlogName FROM Notes
+    UNION
+    SELECT NoteBlogName FROM Notes;
+
+--------------------------------------------------------------------------
+-- STEP 2: the type lookup
+--------------------------------------------------------------------------
+CREATE TABLE NoteTypes (
+    TypeId INTEGER PRIMARY KEY,
+    Type   TEXT NOT NULL UNIQUE
+);
+
+-- IDs are assigned explicitly and must stay stable: they are stored in Notes.
+INSERT INTO NoteTypes (TypeId, Type) VALUES
+    (1, 'like'),
+    (2, 'reblog'),
+    (3, 'reply'),
+    (4, 'posted'),
+    (5, 'post_attribution');
+
+--------------------------------------------------------------------------
+-- STEP 3: rebuild Notes with integer keys
+--------------------------------------------------------------------------
+-- Column order of the primary key is unchanged from the text version, so the
+-- leading-column access patterns callers already rely on still hold:
+-- (RootBlogId) and (RootBlogId, PostID) remain cheap prefixes.
+CREATE TABLE NotesN (
+    RootBlogId      INTEGER NOT NULL,
+    PostID          INTEGER NOT NULL,
+    NoteBlogId      INTEGER NOT NULL,
+    TimeStamp       INTEGER NOT NULL,
+    TypeId          INTEGER NOT NULL,
+    replyText       TEXT,
+    DatetimeCrawled TEXT,
+    DateModified    TEXT,
+    DateCreated     TEXT,
+    IsActive        INTEGER NOT NULL DEFAULT 1,
+    PRIMARY KEY (RootBlogId, PostID, TimeStamp, TypeId, NoteBlogId)
+) WITHOUT ROWID;
+
+-- Inner joins are safe here: BlogNames was just built from these very columns,
+-- and NoteTypes covers all 5 values present. A row that failed to match would
+-- be silently dropped, which is what the row-count check at the bottom is for.
+INSERT INTO NotesN
+SELECT r.BlogId, n.PostID, b.BlogId, n.TimeStamp, t.TypeId,
+       n.replyText, n.DatetimeCrawled, n.DateModified, n.DateCreated, n.IsActive
+  FROM Notes n
+  JOIN BlogNames r ON r.BlogName = n.RootBlogName
+  JOIN BlogNames b ON b.BlogName = n.NoteBlogName
+  JOIN NoteTypes t ON t.Type     = n.Type;
+
+DROP TABLE Notes;
+ALTER TABLE NotesN RENAME TO Notes;
+
+-- Replaces ix_NoteBlogName01. Renamed because it indexes a different column now.
+CREATE INDEX ix_Notes_NoteBlogId ON Notes (NoteBlogId);
+
+--------------------------------------------------------------------------
+-- STEP 4: give Blogs the matching id
+--------------------------------------------------------------------------
+-- Additive: no existing column changes, so TumblThree's
+-- "UPDATE Blogs SET IsActive = 0 ... WHERE BlogName = ?" is untouched.
+ALTER TABLE Blogs ADD COLUMN BlogId INTEGER;
+
+UPDATE Blogs
+   SET BlogId = (SELECT bn.BlogId FROM BlogNames bn WHERE bn.BlogName = Blogs.BlogName);
+
+CREATE INDEX ix_Blogs_BlogId ON Blogs (BlogId);
+
+COMMIT;
+
+--------------------------------------------------------------------------
+-- STEP 5: Write Changes, then Tools > Compact Database
+--------------------------------------------------------------------------
+-- From the CLI instead:  sqlite3 TL.db "VACUUM;"
+
+--------------------------------------------------------------------------
+-- VERIFY
+--------------------------------------------------------------------------
+-- PRAGMA integrity_check;                         -- expect: ok
+-- SELECT COUNT(*) FROM Notes;                     -- expect: 1182333, unchanged
+-- SELECT COUNT(*) FROM BlogNames;                 -- expect: 20430
+-- SELECT COUNT(*) FROM Blogs WHERE BlogId IS NOT NULL;   -- expect: 20418
+--
+-- Losslessness was proven before this ran, by reconstructing the old text shape
+-- from the new schema and diffing it against the original both ways:
+--   SELECT COUNT(*) FROM (SELECT * FROM old.Notes EXCEPT SELECT * FROM Rebuilt);
+--   SELECT COUNT(*) FROM (SELECT * FROM Rebuilt EXCEPT SELECT * FROM old.Notes);
+-- Both returned 0 across all 1,182,333 rows and all 10 columns.

run_500_times.bat

@@ -1,52 +0,0 @@
-@echo off
-REM Batch file to run URLNotesGrabberCORE 500 times in a loop
-
-setlocal enabledelayedexpansion
-
-REM Set the path to the executable
-REM Update this path if your executable is in a different location
-set APP_PATH=URLNotesGrabberCORE.exe
-
-REM Check if the executable exists
-if not exist "%APP_PATH%" (
-    echo Error: %APP_PATH% not found in the current directory.
-    echo Please ensure the executable is in the same directory as this batch file,
-    echo or update the APP_PATH variable with the correct path.
-    pause
-    exit /b 1
-)
-
-REM Loop counter
-set ITERATIONS=500
-set COUNTER=0
-
-echo Starting to run %APP_PATH% %ITERATIONS% times...
-echo.
-
-:LOOP
-set /a COUNTER+=1
-echo [%COUNTER%/%ITERATIONS%] Running iteration %COUNTER%...
-echo Started at: %date% %time%
-
-REM Run the application with -replies option
-call "%APP_PATH%" -replies
-
-REM Check if the application ran successfully
-if errorlevel 1 (
-    echo Warning: Application exited with error code !ERRORLEVEL! on iteration %COUNTER%
-) else (
-    echo Iteration %COUNTER% completed successfully.
-)
-
-echo Completed at: %date% %time%
-echo.
-
-REM Check if we've reached 500 iterations
-if %COUNTER% lss %ITERATIONS% (
-    goto LOOP
-)
-
-echo.
-echo Completed all %ITERATIONS% iterations!
-echo.
-pause

shrink-db.sql

@@ -0,0 +1,159 @@
+-- shrink-db.sql
+-- Reduces TL.db from ~267 MB to ~207 MB (-22%) with no application changes,
+-- and no visible change in any of the three apps that touch this file.
+--
+-- The three consumers, and what each one uses:
+--   URLNotesGrabberCORE  System.Data.SQLite 1.0.119  writes Notes, Posts, Blogs
+--   Rolodex (web)        Microsoft.Data.Sqlite 10.0  reads all three; soft-deletes via IsActive
+--   TumblThree           System.Data.SQLite.Core 1.0.119
+--                        one statement only, ManagerController.cs:972 --
+--                        "UPDATE Blogs SET IsActive = 0, DateModified = @DateModified
+--                         WHERE BlogName = @BlogName"
+--                        Nothing below touches the Blogs table, so TumblThree is
+--                        unaffected. (Its GlobalDatabaseService talks to TumblThree's
+--                        own separate FileEntries/BlogFiles database, not this file.)
+--
+-- WITHOUT ROWID needs SQLite >= 3.8.2 (Dec 2013). All three providers above are
+-- 2024-25 builds, an order of magnitude newer, so STEP 2 is readable by all of them.
+--
+-- Every figure below was measured on a copy of the live 267 MB file, and the
+-- result was checked against all three apps' access patterns:
+--   PRAGMA integrity_check ....... ok
+--   row counts ................... Notes 1182333, Posts 22468, Blogs 188620 (unchanged)
+--   Rolodex soft-delete UPDATE ... works
+--   Rolodex NoteBlogName filter .. still uses ix_NoteBlogName01
+--   crawler INSERT OR IGNORE ..... still dedupes (0 dupes admitted)
+--   TumblThree's UPDATE Blogs ..... untouched -- Blogs is not modified by this script
+--
+-- HOW TO RUN (DB Browser for SQLite):
+--   1. Stop ALL THREE apps: the crawler, the Rolodex web app, and TumblThree.
+--      Rolodex holds the file open and checkpoints the WAL, so it must be down,
+--      not just idle. TumblThree only opens the file for an instant when you
+--      delete a blog, but it can also launch the crawler on its own
+--      (UrlNotesGrabberService) -- so close it rather than merely avoiding it.
+--   2. Back up TL.db (copy the 267 MB file somewhere safe).
+--   3. Open TL.db, go to Execute SQL, paste STEP 1-3, run.
+--   4. Click "Write Changes".
+--   5. Run Tools > Compact Database. This is VACUUM; it will not run from the
+--      Execute SQL tab because DB Browser keeps a transaction open there.
+--      NOTHING SHRINKS ON DISK UNTIL THIS FINISHES.
+--
+-- Expected: steps 1-3 a couple of minutes, Compact a couple more.
+-- Free disk needed during Compact: ~270 MB for the temp copy.
+
+--------------------------------------------------------------------------
+-- STEP 1: drop the TimeStamp index          (required by STEP 2, not optional)
+--------------------------------------------------------------------------
+-- Measured cost/benefit:
+--
+--   * Rolodex's DEFAULT Notes view does not use it. Its sort carries the
+--     tiebreaker "RootBlogName, PostID, NoteBlogName", which forces a full sort
+--     regardless -- the query plan is byte-identical with and without the index.
+--     Sorting.cs:138 already assumes as much, and is right in practice.
+--   * The crawler's collect query (DataAccess.cs:1183) filters
+--     TimeStamp >= 1535778000, which excludes 786 of 1,182,333 rows (0.07%).
+--     A full index scan wearing a disguise. Same measured time without it.
+--   * The reply-matching UPDATE uses ABS(TimeStamp - ?) <= 5, which can never
+--     use an index on TimeStamp.
+--   * It DOES help exactly one path: Rolodex's Notes page with a date-range
+--     filter applied. 60 ms -> 164 ms. That is the whole of what is lost.
+--
+-- And it must go, because after STEP 2 it stops being cheap. A secondary index
+-- on a WITHOUT ROWID table carries the full 5-column primary key instead of a
+-- compact rowid, so this index grows 14 MB -> 58 MB. Keeping it lands the file
+-- at 265 MB instead of 207 MB -- i.e. it cancels the entire exercise to save
+-- 100 ms on one filtered view.
+
+DROP INDEX IF EXISTS Notes_idx_06e01ae3;
+
+--------------------------------------------------------------------------
+-- STEP 2: rebuild Notes as WITHOUT ROWID                       (-32 MB)
+--------------------------------------------------------------------------
+-- Notes has a 5-column composite primary key. In a rowid table SQLite stores
+-- that key twice: once in the table, once in sqlite_autoindex_Notes_1 (62 MB).
+-- WITHOUT ROWID stores the rows *in* the key's b-tree, so the copy disappears.
+--
+-- ix_NoteBlogName01 grows 25 -> 58 MB for the reason described above. Net -32 MB.
+-- It is kept because Rolodex filters on NoteBlogName and the crawler joins on it.
+--
+-- Safe: neither codebase references rowid on Notes (grep across both trees,
+-- zero matches). IsActive keeps its exact current declaration, which is what
+-- Rolodex's ActiveFlag predicate reads.
+
+PRAGMA foreign_keys = off;
+
+CREATE TABLE Notes_new (
+    "RootBlogName"      TEXT,
+    "PostID"            INTEGER,
+    "NoteBlogName"      TEXT,
+    "TimeStamp"         INTEGER,
+    "Type"              TEXT,
+    "replyText"         TEXT DEFAULT '.',
+    "DatetimeCrawled"   TEXT DEFAULT '2/12/26 12am',
+    "DateModified"      TEXT,
+    "DateCreated"       TEXT,
+    IsActive            INTEGER NOT NULL DEFAULT 1,
+    PRIMARY KEY("RootBlogName","PostID","TimeStamp","Type","NoteBlogName")
+) WITHOUT ROWID;
+
+INSERT INTO Notes_new
+SELECT RootBlogName, PostID, NoteBlogName, TimeStamp, Type,
+       replyText, DatetimeCrawled, DateModified, DateCreated, IsActive
+  FROM Notes;
+
+DROP TABLE Notes;
+ALTER TABLE Notes_new RENAME TO Notes;
+
+CREATE INDEX "ix_NoteBlogName01" ON "Notes" ("NoteBlogName");
+
+--------------------------------------------------------------------------
+-- STEP 3: clear the DatetimeCrawled placeholder                (-13 MB)
+--------------------------------------------------------------------------
+-- 1,148,077 of 1,182,333 rows hold the literal DDL default '2/12/26 12am' --
+-- a backfill placeholder, not a crawl time. SQLite stores all 12 bytes of it
+-- on every one of those rows.
+--
+-- This is UI-NEUTRAL in Rolodex, which is why it is safe despite Rolodex
+-- displaying the column. Rolodex reads and sorts it through DateSql.Sortable
+-- (DateRange.cs:67), whose CASE matches '____-__-__%' or the 8-character
+-- '__/__/__'. The 12-character '2/12/26 12am' matches neither, so Sortable
+-- already returns NULL for these rows and the page already renders an em dash
+-- and sorts them to the bottom. RolodexRepository.cs:957-963 documents exactly
+-- this. Writing a real NULL changes the bytes on disk, not the screen.
+--
+-- The crawler never reads the column back -- it only writes it on INSERT
+-- (DataAccess.cs:713, 721).
+
+UPDATE Notes SET DatetimeCrawled = NULL WHERE DatetimeCrawled = '2/12/26 12am';
+
+--------------------------------------------------------------------------
+-- DELIBERATELY NOT DONE: nulling Notes.DateCreated
+--------------------------------------------------------------------------
+-- An earlier draft of this script also cleared DateCreated = '2026-04-13'
+-- (a further -12 MB). Do not. Unlike DatetimeCrawled, that value DOES match
+-- Sortable's '____-__-__%' branch, so Rolodex renders it as a real date in the
+-- "Created" column on the Notes page and Post detail, and sorts by it. Nulling
+-- it would turn visible dates into em dashes and move rows in the sort order.
+
+--------------------------------------------------------------------------
+-- STEP 4: Write Changes, then Tools > Compact Database
+--------------------------------------------------------------------------
+-- Nothing above reclaims disk until VACUUM runs. From the sqlite3 CLI instead:
+--     sqlite3 TL.db "VACUUM;"
+
+--------------------------------------------------------------------------
+-- VERIFY (run after compacting; file should be ~207 MB)
+--------------------------------------------------------------------------
+-- PRAGMA integrity_check;
+--
+-- SELECT 'Notes' t, COUNT(*) n FROM Notes
+-- UNION ALL SELECT 'Posts', COUNT(*) FROM Posts
+-- UNION ALL SELECT 'Blogs', COUNT(*) FROM Blogs;
+--   -- expect 1182333 / 22468 / 188620, unchanged
+--
+-- SELECT name, SUM(pgsize)/1024/1024 AS mb
+--   FROM dbstat GROUP BY name ORDER BY SUM(pgsize) DESC;
+--   -- expect Notes 78, ix_NoteBlogName01 58, Posts 50, Blogs 14
+--
+-- APPLIED 2026-08-07. Actual result: 267.32 MB -> 207.17 MB, integrity_check ok,
+-- row counts unchanged, journal_mode still wal. VACUUM took 6 seconds.

verify-db-schema.sql

@@ -0,0 +1,247 @@
+-- ============================================================================
+-- verify-db-schema.sql
+--
+-- Purpose: Verify that a TL.db (e.g. a restored backup) has every column the
+--          current URLNotesGrabberCORE code expects. The app has NO startup
+--          migration: missing columns only get added when specific modes run,
+--          and a referenced-but-missing column causes a "no such column" crash.
+--
+-- How to use (DB Browser for SQLite):
+--   1. File > Open Database  ->  pick the restored backup.
+--   2. Execute SQL tab. Run SECTION 1 (it is read-only).
+--        * Zero rows from every query  = schema is fully aligned, you're done.
+--        * Rows in "MISSING COLUMNS"    = copy the run_this_to_fix text.
+--   3. If columns are missing: KEEP A COPY OF THE BACKUP FIRST, then go to
+--      SECTION 2, uncomment ONLY the ALTER lines that match the report, and run.
+--   4. Re-run SECTION 1 to confirm zero rows.
+--
+-- This script never UPDATEs/DELETEs/DROPs. In particular it deliberately does
+-- NOT replicate the likes-reset that the app's -likes migration performs
+-- (DataAccess.cs:375), so existing likes high-water marks are preserved.
+-- ============================================================================
+
+
+-- ============================================================================
+-- SECTION 1  --  VERIFICATION (read-only)
+-- ============================================================================
+
+-- Expected schema for the current code version.
+-- alter_stmt is a runnable ALTER for additively-fixable columns; for base
+-- columns it is a 'MANUAL REVIEW' note (a missing base column means the backup
+-- predates the table's creation or is damaged -- do not blindly auto-add).
+WITH expected(tbl, col, alter_stmt) AS (
+  VALUES
+    -- Posts (base columns: manual review if missing)
+    ('Posts','BlogName',              'MANUAL REVIEW - base/PK column missing'),
+    ('Posts','PostID',                'MANUAL REVIEW - base/PK column missing'),
+    ('Posts','HasNotesGathered',      'MANUAL REVIEW - base column missing'),
+    ('Posts','reblogURL',             'MANUAL REVIEW - base column missing'),
+    ('Posts','NotFound',              'MANUAL REVIEW - base column missing'),
+    ('Posts','PostDate',              'MANUAL REVIEW - base column missing'),
+    ('Posts','NotesGatheredDateTime', 'MANUAL REVIEW - base column missing'),
+    ('Posts','HasImage',              'MANUAL REVIEW - base column missing'),
+    ('Posts','PostURL',               'MANUAL REVIEW - base column missing'),
+    ('Posts','Slug',                  'MANUAL REVIEW - base column missing'),
+    ('Posts','ReblogKey',             'MANUAL REVIEW - base column missing'),
+    ('Posts','ReblogName',            'MANUAL REVIEW - base column missing'),
+    ('Posts','Summary',               'MANUAL REVIEW - base column missing'),
+    ('Posts','Quote',                 'MANUAL REVIEW - base column missing'),
+    ('Posts','Body',                  'MANUAL REVIEW - base column missing'),
+    ('Posts','Tags',                  'MANUAL REVIEW - base column missing'),
+    ('Posts','Link',                  'MANUAL REVIEW - base column missing'),
+    ('Posts','PhotoURL',              'MANUAL REVIEW - base column missing'),
+    ('Posts','PhotoCaption',          'MANUAL REVIEW - base column missing'),
+    ('Posts','DownloadedFiles',       'MANUAL REVIEW - base column missing'),
+    ('Posts','AudioCaption',          'MANUAL REVIEW - base column missing'),
+    ('Posts','Question',              'MANUAL REVIEW - base column missing'),
+    ('Posts','Answer',                'MANUAL REVIEW - base column missing'),
+    ('Posts','Title',                 'MANUAL REVIEW - base column missing'),
+    ('Posts','ByLikes',               'MANUAL REVIEW - base column missing'),
+    ('Posts','RootBlogName',          'MANUAL REVIEW - base column missing'),
+    ('Posts','RootURL',               'MANUAL REVIEW - base column missing'),
+    ('Posts','DateModified',          'MANUAL REVIEW - base column missing'),
+    ('Posts','DateCreated',           'MANUAL REVIEW - base column missing'),
+    -- Posts (additive migration column, auto-fixable)
+    ('Posts','PostType',              'ALTER TABLE Posts ADD COLUMN PostType TEXT;'),
+
+    -- Blogs (base columns: manual review if missing)
+    ('Blogs','BlogName',              'MANUAL REVIEW - base/PK column missing'),
+    ('Blogs','HasBeenOutput',         'MANUAL REVIEW - base column missing'),
+    ('Blogs','IsActive',              'MANUAL REVIEW - base column missing'),
+    ('Blogs','DateAdded',             'MANUAL REVIEW - base column missing'),
+    ('Blogs','ByLikes',               'MANUAL REVIEW - base column missing'),
+    ('Blogs','DateModified',          'MANUAL REVIEW - base column missing'),
+    ('Blogs','DateCreated',           'MANUAL REVIEW - base column missing'),
+    -- Blogs (additive migration columns, auto-fixable)
+    ('Blogs','LikesPulled',           'ALTER TABLE Blogs ADD COLUMN LikesPulled INTEGER DEFAULT 0;'),
+    ('Blogs','LikesCursor',           'ALTER TABLE Blogs ADD COLUMN LikesCursor INTEGER DEFAULT 0;'),
+    ('Blogs','LikesNewestTimestamp',  'ALTER TABLE Blogs ADD COLUMN LikesNewestTimestamp INTEGER DEFAULT 0;'),
+    ('Blogs','LikesLastRefreshed',    'ALTER TABLE Blogs ADD COLUMN LikesLastRefreshed INTEGER DEFAULT 0;'),
+    ('Blogs','LikesLastNewCount',     'ALTER TABLE Blogs ADD COLUMN LikesLastNewCount INTEGER DEFAULT 0;'),
+    ('Blogs','TTFolderPath',          'ALTER TABLE Blogs ADD COLUMN TTFolderPath TEXT;'),
+    -- Blogs.BlogId (2026-08-07) is the single-hop join key into Notes. Deliberately NOT
+    -- auto-fixable: an added-but-empty BlogId makes every engagement join return zero
+    -- rows silently, which is worse than the hard error a missing column gives.
+    ('Blogs','BlogId',                'MANUAL REVIEW - see query 1d: run normalize-notes.sql'),
+
+    -- Notes (base columns: manual review if missing)
+    -- Integer IDs since 2026-08-07. RootBlogName/NoteBlogName/Type are GONE, not renamed
+    -- in place -- a backup that still has them needs normalize-notes.sql, not an ALTER.
+    -- Query 1d below reports exactly that case.
+    ('Notes','RootBlogId',            'MANUAL REVIEW - see query 1d: pre-2026-08-07 name schema, or damaged'),
+    ('Notes','PostID',                'MANUAL REVIEW - base/PK column missing'),
+    ('Notes','NoteBlogId',            'MANUAL REVIEW - see query 1d: pre-2026-08-07 name schema, or damaged'),
+    ('Notes','TimeStamp',             'MANUAL REVIEW - base/PK column missing'),
+    ('Notes','TypeId',                'MANUAL REVIEW - see query 1d: pre-2026-08-07 name schema, or damaged'),
+    ('Notes','DatetimeCrawled',       'MANUAL REVIEW - base column missing'),
+    ('Notes','DateModified',          'MANUAL REVIEW - base column missing'),
+    ('Notes','DateCreated',           'MANUAL REVIEW - base column missing'),
+    -- Notes (additive migration column, auto-fixable)
+    -- No DEFAULT: the migrated schema dropped it, so new rows get NULL rather than a
+    -- placeholder. EnsureReplyTextColumnExists in DataAccess.cs adds it the same way.
+    ('Notes','replyText',             'ALTER TABLE Notes ADD COLUMN replyText TEXT;'),
+
+    -- BlogNames / NoteTypes (the lookup tables Notes resolves its IDs through, 2026-08-07).
+    -- Not auto-fixable: an empty BlogNames does not mean "add the table", it means the
+    -- Notes rows have nothing to resolve against. Rebuild with normalize-notes.sql.
+    ('BlogNames','BlogId',            'MANUAL REVIEW - see query 1d: run normalize-notes.sql'),
+    ('BlogNames','BlogName',          'MANUAL REVIEW - see query 1d: run normalize-notes.sql'),
+    ('NoteTypes','TypeId',            'MANUAL REVIEW - see query 1d: run normalize-notes.sql'),
+    ('NoteTypes','Type',              'MANUAL REVIEW - see query 1d: run normalize-notes.sql'),
+
+    -- DailyAPICount (base columns)
+    ('DailyAPICount','Date',          'MANUAL REVIEW - base/PK column missing'),
+    ('DailyAPICount','APICount',      'MANUAL REVIEW - base column missing'),
+
+    -- ApiKeyPoolState (created at runtime by EnsureApiKeyPoolTables; auto-fixable by re-running app, but safe to add)
+    ('ApiKeyPoolState','KeyName',     'MANUAL REVIEW - run app once to auto-create ApiKeyPool tables'),
+    ('ApiKeyPoolState','RetryUntil',  'MANUAL REVIEW - run app once to auto-create ApiKeyPool tables'),
+    ('ApiKeyPoolMeta','Id',           'MANUAL REVIEW - run app once to auto-create ApiKeyPool tables'),
+    ('ApiKeyPoolMeta','LastIndex',    'MANUAL REVIEW - run app once to auto-create ApiKeyPool tables')
+),
+actual(tbl, col) AS (
+  SELECT 'Posts',           name FROM pragma_table_info('Posts')
+  UNION ALL SELECT 'Blogs',           name FROM pragma_table_info('Blogs')
+  UNION ALL SELECT 'Notes',           name FROM pragma_table_info('Notes')
+  UNION ALL SELECT 'BlogNames',       name FROM pragma_table_info('BlogNames')
+  UNION ALL SELECT 'NoteTypes',       name FROM pragma_table_info('NoteTypes')
+  UNION ALL SELECT 'DailyAPICount',   name FROM pragma_table_info('DailyAPICount')
+  UNION ALL SELECT 'ApiKeyPoolState', name FROM pragma_table_info('ApiKeyPoolState')
+  UNION ALL SELECT 'ApiKeyPoolMeta',  name FROM pragma_table_info('ApiKeyPoolMeta')
+)
+
+-- 1a. MISSING COLUMNS: columns the code needs that the DB does not have.
+--     Zero rows = good. Otherwise copy run_this_to_fix into SECTION 2.
+SELECT
+  e.tbl              AS table_name,
+  e.col              AS missing_column,
+  e.alter_stmt       AS run_this_to_fix
+FROM expected e
+LEFT JOIN actual a
+  ON a.tbl = e.tbl AND lower(a.col) = lower(e.col)
+WHERE a.col IS NULL
+ORDER BY (e.alter_stmt LIKE 'ALTER%') DESC, e.tbl, e.col;
+
+
+-- 1b. MISSING TABLES: expected tables that don't exist at all in this DB.
+--     Zero rows = good.
+WITH expected_tables(tbl) AS (
+  VALUES ('Posts'),('Blogs'),('Notes'),('BlogNames'),('NoteTypes'),('DailyAPICount'),
+         ('ApiKeyPoolState'),('ApiKeyPoolMeta')
+)
+SELECT et.tbl AS missing_table
+FROM expected_tables et
+WHERE NOT EXISTS (
+  SELECT 1 FROM sqlite_master
+  WHERE type = 'table' AND lower(name) = lower(et.tbl)
+)
+ORDER BY et.tbl;
+
+
+-- 1c. EXTRA / UNEXPECTED COLUMNS: present in the DB but not in the expected
+--     list above. Informational only -- e.g. a NEWER backup, or a column this
+--     script's expected-list hasn't been updated for. Not an error by itself.
+--     Posts.IsActive and Notes.IsActive are listed here and NOT in 1a on
+--     purpose: they are written by other tools, the app only reads them when
+--     present, and it must not be told to add them. See TL.db.md.
+WITH expected(tbl, col) AS (
+  VALUES
+    ('Posts','BlogName'),('Posts','PostID'),('Posts','HasNotesGathered'),('Posts','reblogURL'),
+    ('Posts','NotFound'),('Posts','PostDate'),('Posts','NotesGatheredDateTime'),('Posts','HasImage'),
+    ('Posts','PostURL'),('Posts','Slug'),('Posts','ReblogKey'),('Posts','ReblogName'),('Posts','Summary'),
+    ('Posts','Quote'),('Posts','Body'),('Posts','Tags'),('Posts','Link'),('Posts','PhotoURL'),
+    ('Posts','PhotoCaption'),('Posts','DownloadedFiles'),('Posts','AudioCaption'),('Posts','Question'),
+    ('Posts','Answer'),('Posts','Title'),('Posts','ByLikes'),('Posts','RootBlogName'),('Posts','RootURL'),
+    ('Posts','DateModified'),('Posts','DateCreated'),('Posts','PostType'),('Posts','IsActive'),
+    ('Blogs','BlogName'),('Blogs','HasBeenOutput'),('Blogs','IsActive'),('Blogs','DateAdded'),
+    ('Blogs','ByLikes'),('Blogs','DateModified'),('Blogs','DateCreated'),('Blogs','LikesPulled'),
+    ('Blogs','LikesCursor'),('Blogs','LikesNewestTimestamp'),('Blogs','LikesLastRefreshed'),
+    ('Blogs','LikesLastNewCount'),('Blogs','TTFolderPath'),('Blogs','BlogId'),
+    ('Notes','RootBlogId'),('Notes','PostID'),('Notes','NoteBlogId'),('Notes','TimeStamp'),
+    ('Notes','TypeId'),('Notes','DatetimeCrawled'),('Notes','DateModified'),('Notes','DateCreated'),
+    ('Notes','replyText'),('Notes','IsActive'),
+    ('BlogNames','BlogId'),('BlogNames','BlogName'),
+    ('NoteTypes','TypeId'),('NoteTypes','Type'),
+    ('DailyAPICount','Date'),('DailyAPICount','APICount'),
+    ('ApiKeyPoolState','KeyName'),('ApiKeyPoolState','RetryUntil'),
+    ('ApiKeyPoolMeta','Id'),('ApiKeyPoolMeta','LastIndex')
+),
+actual(tbl, col) AS (
+  SELECT 'Posts',           name FROM pragma_table_info('Posts')
+  UNION ALL SELECT 'Blogs',           name FROM pragma_table_info('Blogs')
+  UNION ALL SELECT 'Notes',           name FROM pragma_table_info('Notes')
+  UNION ALL SELECT 'BlogNames',       name FROM pragma_table_info('BlogNames')
+  UNION ALL SELECT 'NoteTypes',       name FROM pragma_table_info('NoteTypes')
+  UNION ALL SELECT 'DailyAPICount',   name FROM pragma_table_info('DailyAPICount')
+  UNION ALL SELECT 'ApiKeyPoolState', name FROM pragma_table_info('ApiKeyPoolState')
+  UNION ALL SELECT 'ApiKeyPoolMeta',  name FROM pragma_table_info('ApiKeyPoolMeta')
+)
+SELECT a.tbl AS table_name, a.col AS unexpected_column
+FROM actual a
+LEFT JOIN expected e
+  ON e.tbl = a.tbl AND lower(e.col) = lower(a.col)
+WHERE e.col IS NULL
+ORDER BY a.tbl, a.col;
+
+
+-- 1d. PRE-MIGRATION DATABASE: a backup from before 2026-08-07, when Notes still
+--     stored names. Zero rows = good.
+--
+--     This is the one failure SECTION 2 cannot fix. Notes.RootBlogName /
+--     NoteBlogName / Type were replaced by RootBlogId / NoteBlogId / TypeId
+--     resolving through BlogNames and NoteTypes -- a data migration, not an
+--     ADD COLUMN. There is no compatibility view, so the current code fails
+--     outright ("no such column: RootBlogId") against such a file.
+--
+--     Fix: run normalize-notes.sql against a COPY of the backup, then re-run
+--     SECTION 1. Do not hand-add the ID columns: they would be empty, and an
+--     empty NoteBlogId is indistinguishable from a note by blog #0.
+SELECT 'Notes still stores names -- run normalize-notes.sql on a copy' AS pre_migration_schema,
+       group_concat(name, ', ')                                        AS legacy_columns_found
+FROM pragma_table_info('Notes')
+WHERE lower(name) IN ('rootblogname','noteblogname','type')
+HAVING COUNT(*) > 0;
+
+
+-- ============================================================================
+-- SECTION 2  --  FIX (opt-in, additive only)
+--
+-- Run ONLY the lines that query 1a flagged with an ALTER statement.
+-- KEEP A COPY OF THE BACKUP FIRST. SQLite has no "ADD COLUMN IF NOT EXISTS",
+-- so running an ALTER for a column that already exists throws a harmless
+-- "duplicate column name" error and changes nothing -- just run the flagged
+-- subset. These are the 8 additive migration columns and nothing else; the
+-- likes high-water-mark reset is intentionally NOT included.
+--
+-- Nothing here addresses query 1d. The Notes integer schema is a data migration
+-- (normalize-notes.sql) and cannot be reached by adding columns.
+-- ============================================================================
+
+-- ALTER TABLE Posts ADD COLUMN PostType TEXT;
+-- ALTER TABLE Blogs ADD COLUMN LikesPulled INTEGER DEFAULT 0;
+-- ALTER TABLE Blogs ADD COLUMN LikesCursor INTEGER DEFAULT 0;
+-- ALTER TABLE Blogs ADD COLUMN LikesNewestTimestamp INTEGER DEFAULT 0;
+-- ALTER TABLE Blogs ADD COLUMN LikesLastRefreshed INTEGER DEFAULT 0;
+-- ALTER TABLE Blogs ADD COLUMN LikesLastNewCount INTEGER DEFAULT 0;
+-- ALTER TABLE Blogs ADD COLUMN TTFolderPath TEXT;
+-- ALTER TABLE Notes ADD COLUMN replyText TEXT;