fix: add runtime schema guard for skipped count

app/db.py

@@ -1,6 +1,6 @@
 from collections.abc import Generator
 
-from sqlalchemy import create_engine
+from sqlalchemy import create_engine, inspect, text
 from sqlalchemy.orm import DeclarativeBase, Session, sessionmaker
 
 from app.config import get_settings
@@ -25,6 +25,17 @@ def init_db() -> None:
     import app.models  # noqa: F401
 
     Base.metadata.create_all(bind=engine)
+    _ensure_runtime_schema()
+
+
+def _ensure_runtime_schema() -> None:
+    inspector = inspect(engine)
+    if "crawl_runs" not in inspector.get_table_names():
+        return
+    crawl_run_columns = {column["name"] for column in inspector.get_columns("crawl_runs")}
+    if "skipped_count" not in crawl_run_columns:
+        with engine.begin() as connection:
+            connection.execute(text("ALTER TABLE crawl_runs ADD COLUMN skipped_count INTEGER NOT NULL DEFAULT 0"))
 
 
 def get_db() -> Generator[Session, None, None]: