Disconnect Alembic connection to ensure it re-connects after backfill

data/migrations/versions/703298a825c2_backfill_new_encrypted_fields.py

@@ -130,6 +130,12 @@ class OAuthApplication(BaseModel):
 def upgrade(tables, tester, progress_reporter):
     op = ProgressWrapper(original_op, progress_reporter)
 
+    # NOTE: Disconnects the Alembic database connection. We do this because the Peewee calls below
+    # use a *different* connection, and if we leave the alembic connection open, it'll time out.
+    # See: https://github.com/sqlalchemy/alembic/issues/630
+    op.get_bind().execute("COMMIT")
+    op.get_bind().invalidate()
+
     from app import app
 
     if app.config.get("SETUP_COMPLETE", False) or tester.is_testing():