[fix]. Harden DB baseline preflight [skip ci]

docker/entrypoint.sh

@@ -8,7 +8,7 @@ from sqlalchemy import create_engine, inspect, text
 from gitea_codex_bot.config import get_settings
 
 settings = get_settings()
-engine = create_engine(settings.database_url)
+engine = create_engine(settings.sqlalchemy_url)
 
 with engine.connect() as conn:
     inspector = inspect(conn)
@@ -17,8 +17,14 @@ with engine.connect() as conn:
     has_alembic_version = "alembic_version" in tables
     has_review_jobs = "review_jobs" in tables
     has_webhook_events = "webhook_events" in tables
+    stamped_revision = None
 
-    if not has_alembic_version and (has_review_jobs or has_webhook_events):
+    if has_alembic_version:
+        row = conn.execute(text("SELECT version_num FROM alembic_version LIMIT 1")).fetchone()
+        if row and row[0]:
+            stamped_revision = row[0]
+
+    if (not has_alembic_version or not stamped_revision) and (has_review_jobs or has_webhook_events):
         revision = "0001_initial"
         if has_review_jobs:
             columns = {c["name"] for c in inspector.get_columns("review_jobs")}