feat: complete v0.5 operations foundation

lib/db.ts

@@ -81,6 +81,13 @@ CREATE UNIQUE INDEX IF NOT EXISTS source_remote_identity_unique ON sources(base_
 CREATE TABLE IF NOT EXISTS schema_migrations (
   version INTEGER PRIMARY KEY, applied_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
 );
+CREATE TABLE IF NOT EXISTS rate_limits (
+  bucket TEXT PRIMARY KEY, count INTEGER NOT NULL, reset_at INTEGER NOT NULL
+);
+CREATE TABLE IF NOT EXISTS error_events (
+  id INTEGER PRIMARY KEY, scope TEXT NOT NULL, message TEXT NOT NULL, context_json TEXT,
+  created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
 `);
 
 db.exec("INSERT OR IGNORE INTO source_members(source_id,user_id,role) SELECT id,user_id,'owner' FROM sources");
@@ -108,6 +115,8 @@ applyColumnMigration(14, "sources", "remote_avatar_url", "ALTER TABLE sources AD
 applyColumnMigration(15, "sources", "last_connection_at", "ALTER TABLE sources ADD COLUMN last_connection_at TEXT");
 applyColumnMigration(16, "sources", "last_connection_error", "ALTER TABLE sources ADD COLUMN last_connection_error TEXT");
 applyColumnMigration(17, "posts", "remote_url", "ALTER TABLE posts ADD COLUMN remote_url TEXT");
+db.prepare("INSERT OR IGNORE INTO schema_migrations(version) VALUES(18)").run();
+db.prepare("INSERT OR IGNORE INTO schema_migrations(version) VALUES(19)").run();
 
 const admin = process.env.ADMIN_USERNAME;
 const adminPassword = process.env.ADMIN_PASSWORD;