Changes Summary

appsettings.json — Added PoolEnabled to each API section:
- TumblrApi → true
- TumblrApi3 → false
- TumblrApi4 → true
DataAccess.cs — Added:
- ApiKeyConfig class — holds credentials + metadata per key
- ApiKeyPool class — manages pool with round-robin rotation, SQLite-backed state (ApiKeyPoolState, ApiKeyPoolMeta tables)
  - GetCurrentKey() — returns next key, skipping rate-limited ones, falls back to earliest-recovery if all are throttled
  - MarkRateLimited(key, retryUntil) / MarkAvailable(key) — persists state
  - Initialize() — discovers pool-enabled keys, detects single-key override mode
- Refactored APIAccess.GrabNotes(), GrabPostWithReplies(), GrabLikes() to accept ApiKeyConfig param and log [Key#N]
Program.cs — Updated:
- Tracks apiExplicitlySet flag from -api/-api3/-api4
- Initializes ApiKeyPool at startup (pool mode or single-key override)
- All 3 API callers updated to use pool rotation + 429 handling
Startup Output
- Pool mode: [Pool] Active keys: Key#1=TumblrApi, Key#2=TumblrApi4
- Single-key: [Pool] Single-key mode: TumblrApi3

URLNotesGrabberCORE/appsettings.json

@@ -17,18 +17,21 @@
     "ConsumerKey": "PtsBCGumcsgihyynxUh8b47Jfmi7uXhEIOU46bmhdsUSJ5mEP3",
     "ConsumerSecret": "sA8BwNVTVKqBRRJmHbAD6NuyKPJ3bb9cei2bYhMgqT8cLX8tSG",
     "OAuthToken": "HPJI6IijHoKN6WzBumG7KjS7g01iCu07jQsulpueKbWN1ZJ35J",
-    "OAuthTokenSecret": "ajkN0Z1kKrsJaIXZEDI8zLsjRSQxFkfgO1i5k78FuQYCQjSY7w"
+    "OAuthTokenSecret": "ajkN0Z1kKrsJaIXZEDI8zLsjRSQxFkfgO1i5k78FuQYCQjSY7w",
+    "PoolEnabled": true
   },
   "TumblrApi3": {
     "ConsumerKey": "Jmoh13AS9hKBYsf939uENQsiWUuZJLFT3do4YK9P0bpspVuxkH",
     "ConsumerSecret": "8LcHjuqpOS9gZZPaML1joT330w5NqyGdreSqSBazdAWCADzcms",
     "OAuthToken": "Gm2esFTeb5LKsb4A2YJGrF2Udycfc0AF8afof2qNGyzNSq1qWM",
-    "OAuthTokenSecret": "Kfokor80s5fVue91OmNHidCdILZ9AnHtRplrct2P6Q75jgNTLa"
+    "OAuthTokenSecret": "Kfokor80s5fVue91OmNHidCdILZ9AnHtRplrct2P6Q75jgNTLa",
+    "PoolEnabled": false
   },
   "TumblrApi4": {
     "ConsumerKey": "gOuydIEENkRmEvvuf57R69yPRb39FC0Egb9p6ntxWuCuFzlsV3",
     "ConsumerSecret": "0my913slXAHgra4mEEYV98stJ3wXGjPTWJeviiZXwJ2AqzYtIF   ",
     "OAuthToken": "JHk08YufSrsetTR1Ekuh10cPOzC6rjqU5WwVu3uV4vvLzp0w8w",
-    "OAuthTokenSecret": "1oryr4WMBxuDrt4vL4sJQs5qNagkH3KxwIf61M8SfvklTrhHSb"
+    "OAuthTokenSecret": "1oryr4WMBxuDrt4vL4sJQs5qNagkH3KxwIf61M8SfvklTrhHSb",
+    "PoolEnabled": true
   }
 }