Added pragma on file connections and DROP TABLE IF EXISTS (#706)

* Added pragma on file connections and DROP TABLE IF EXISTS

* Changed comment

* Formatting changes

* Changes to PRAGMA

Author: aponcedeleonch

migrations/env.py

@@ -35,6 +35,7 @@ def run_migrations_offline() -> None:
         target_metadata=target_metadata,
         literal_binds=True,
         dialect_opts={"paramstyle": "named"},
+        transactional_ddl=True,
     )
 
     with context.begin_transaction():

migrations/versions/2025_01_21_0820-4dec3e456c9e_add_on_delete_cascade.py

@@ -21,6 +21,7 @@ def upgrade() -> None:
     # To add ON DELETE CASCADE to the foreign key constraint, we need to
     # rename the table, create a new table with the constraint, and copy
     # the data over.
+    op.execute("DROP TABLE IF EXISTS _prompts_old;")
     op.execute("ALTER TABLE prompts RENAME TO _prompts_old;")
     op.execute(
         """
@@ -39,6 +40,7 @@ def upgrade() -> None:
     op.execute("DROP TABLE _prompts_old;")
 
     # Doing the same for the sessions table
+    op.execute("DROP TABLE IF EXISTS _sessions_old;")
     op.execute("ALTER TABLE sessions RENAME TO _sessions_old;")
     op.execute(
         """
@@ -54,6 +56,7 @@ def upgrade() -> None:
     op.execute("DROP TABLE _sessions_old;")
 
     # Doing the same for the output table
+    op.execute("DROP TABLE IF EXISTS _outputs_old;")
     op.execute("ALTER TABLE outputs RENAME TO _outputs_old;")
     op.execute(
         """
@@ -70,6 +73,7 @@ def upgrade() -> None:
     op.execute("DROP TABLE _outputs_old;")
 
     # Doing the same for the alerts table
+    op.execute("DROP TABLE IF EXISTS _alerts_old;")
     op.execute("ALTER TABLE alerts RENAME TO _alerts_old;")
     op.execute(
         """
@@ -89,7 +93,7 @@ def upgrade() -> None:
     op.execute("DROP TABLE _alerts_old;")
 
     # Dropping unused table
-    op.execute("DROP TABLE settings;")
+    op.execute("DROP TABLE IF EXISTS settings;")
 
     # Create indexes for foreign keys
     op.execute("CREATE INDEX idx_outputs_prompt_id ON outputs(prompt_id);")