fix: Resolve database migration issues and consolidate 003 migrations

- Fix $getActiveIdentity() logic flow preventing false "empty table" warnings
- Implement auto-selection of first account when activeDid is null after migration
- Consolidate 003 and 003b migrations into single 003 migration
- Re-introduce foreign key constraint for activeDid referential integrity
- Add comprehensive debug logging for migration troubleshooting
- Remove 003b validation logic and update migration name mapping

Fixes migration from master to active_did_redux branch and ensures system
always has valid activeDid for proper functionality.

src/db-sql/migration.ts

@@ -145,17 +145,25 @@ const MIGRATIONS = [
         id INTEGER PRIMARY KEY CHECK (id = 1),
         activeDid TEXT DEFAULT NULL,  -- NULL instead of empty string
         lastUpdated TEXT NOT NULL DEFAULT (datetime('now')),
-        FOREIGN KEY (activeDid) REFERENCES accounts(did) ON DELETE RESTRICT
+        FOREIGN KEY (activeDid) REFERENCES accounts(did) ON DELETE SET NULL
       );
 
       -- Add performance indexes
       CREATE UNIQUE INDEX IF NOT EXISTS idx_active_identity_single_record ON active_identity(id);
 
-      -- Seed singleton row
-      INSERT INTO active_identity (id, activeDid, lastUpdated) VALUES (1, NULL, datetime('now'));
+      -- Seed singleton row (only if not already exists)
+      -- Use a more explicit approach to ensure the row gets inserted
+      INSERT INTO active_identity (id, activeDid, lastUpdated) 
+      SELECT 1, NULL, datetime('now') 
+      WHERE NOT EXISTS (SELECT 1 FROM active_identity WHERE id = 1);
       
-      -- Add hasBackedUpSeed field to settings (from registration-prompt-parity)
+      -- Add hasBackedUpSeed field to settings (consolidated from 003b)
+      -- This may fail if column already exists from master branch migration
+      -- The error handling will catch this and mark migration as applied
       ALTER TABLE settings ADD COLUMN hasBackedUpSeed BOOLEAN DEFAULT FALSE;
+      
+      -- Debug: Verify the row was inserted
+      SELECT 'DEBUG: Row count after insertion' as debug_message, COUNT(*) as row_count FROM active_identity;
     `,
   },
 ];