chore: sync submodule state (parent ref update)

Made-with: Cursor

docs/PRODUCTION_CHECKLIST.md

@@ -0,0 +1,20 @@
+# Production Checklist
+
+Before running the Explorer API and indexer in production:
+
+1. **Set a strong `JWT_SECRET`**  
+   Do not use the placeholder from the env template. Generate a secure value, e.g.:
+   ```bash
+   export JWT_SECRET=$(openssl rand -hex 32)
+   ```
+   See `deployment/ENVIRONMENT_TEMPLATE.env` for all required variables.
+
+2. **Run database migrations**  
+   Apply migrations before starting the API and indexer, e.g.:
+   ```bash
+   psql -U explorer -d explorer -f backend/database/migrations/0010_track_schema.up.sql
+   ```
+   Or use your migration runner (e.g. `go run backend/database/migrations/migrate.go --up` if applicable).
+
+3. **Configure DB and RPC**  
+   Ensure `DB_*`, `RPC_URL`, `WS_URL`, and `CHAIN_ID` are set correctly for the target environment.