jimandClaude Opus 5
ab36085ba8
BREAKING CHANGE: Notes.RootBlogName, Notes.NoteBlogName and Notes.Type no
longer exist. They are RootBlogId, NoteBlogId and TypeId, resolved through two
new lookup tables. Every Notes query in this repo and in Rolodex fails against
a migrated database until rewritten. Neither application is ported yet.
TumblThree is unaffected -- it touches only Blogs.
Takes TL.db from 207 MB to 148 MB (-29%); cumulative with this morning's
WITHOUT ROWID change, 267 MB to 148 MB (-45%). The names were text repeated
across 1.18M rows, in the table and again in every index over it.
BlogNames(BlogId, BlogName) 20,430 rows, the ID authority
NoteTypes(TypeId, Type) 5 rows, a table rather than a CHECK so a new
type is an INSERT not a migration
Blogs.BlogId new, additive, NULL on the 168,202 blogs with
no notes
Blogs.BlogId exists so Notes reaches Blogs in one integer hop instead of going
through BlogNames and ending in the text comparison this change was meant to
remove. It costs 2 MB and is purely additive, which is what leaves TumblThree
untouched.
BlogNames is built from Notes rather than from Blogs, deliberately: 12 engagers
have no registry row, and sourcing it from Blogs would have dropped their notes
through the migration's inner joins.
Proven lossless before and after applying to the live file: the old text shape
was reconstructed from the new schema and diffed against the pre-migration
database in both directions. Zero rows differed either way across all 1,182,333
rows and all ten columns. integrity_check ok, journal_mode still wal.
A view-plus-INSTEAD-OF-triggers compatibility shim was built and measured
first. It worked completely -- reads, INSERT OR IGNORE dedup, both apps' update
paths, cross-table transactions -- but cost 194 ms to 321 ms on Rolodex's
unfiltered Notes page, and a clean break was chosen over carrying it.
TL.db.md gains a "Porting to the integer schema" section: column mapping and
the old-to-new form of every query shape the two applications use, including
the INSERT-OR-IGNORE-into-BlogNames-first pattern for notes naming a blog that
has no ID yet. Roughly 14 call sites in DataAccess.cs, 16 in
RolodexRepository.cs. Every documented snippet was executed against the live
file. Also flags that the duplicate-key error string DataAccess.cs matches on
at two sites now names the new columns and will no longer match.
Unrelated corrections found while refreshing the counts, all of which had
drifted on their own: Posts.PostType is no longer NULL on every row but
populated on 20,679 of 22,468, which invalidates the stated reason both this
document and Rolodex derive post type from content instead of reading it; the
Posts.IsActive and Notes.IsActive columns described as "not in this database
yet" both exist; and the registry is 188,620 blogs, not 144,367.
Co-Authored-By: Claude Opus 5 <[email protected]>