Make migration 1 idempotent

surfsense_backend/alembic/versions/1_add_github_connector_enum.py

@@ -7,6 +7,8 @@ Revises:
 
 from collections.abc import Sequence
 
+import sqlalchemy as sa
+
 from alembic import op
 
 # Import pgvector if needed for other types, though not for this ENUM change
@@ -20,9 +22,25 @@ branch_labels: str | Sequence[str] | None = None
 depends_on: str | Sequence[str] | None = None
 
 
+def enum_exists(enum_name: str) -> bool:
+    """Check if an enum type exists in the database."""
+    conn = op.get_bind()
+    result = conn.execute(
+        sa.text(
+            "SELECT EXISTS (SELECT 1 FROM pg_type WHERE typname = :enum_name)"
+        ),
+        {"enum_name": enum_name},
+    )
+    return result.scalar()
+
+
 def upgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
 
+    # Skip if the enum doesn't exist (fresh DB after downgrade - create_db_and_tables will handle it)
+    if not enum_exists("searchsourceconnectortype"):
+        return
+
     # Manually add the command to add the enum value
     # Note: It's generally better to let autogenerate handle this, but we're bypassing it
     op.execute(
@@ -51,6 +69,10 @@ END$$;
 def downgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
 
+    # Skip if the enum doesn't exist
+    if not enum_exists("searchsourceconnectortype"):
+        return
+
     # Downgrading removal of an enum value is complex and potentially dangerous
     # if the value is in use. Often omitted or requires manual SQL based on context.
     # For now, we'll just pass. If you needed to reverse this, you'd likely