Introduce ON_DELTE_CASCADE condition to all FKs

Until now we had ON_DELETE_NO_ACTION since it's the default

Author: aponcedeleonch

migrations/versions/2025_01_21_0820-4dec3e456c9e_add_on_delete_cascade.py

@@ -0,0 +1,115 @@
+"""add_on_delete_cascade
+
+Revision ID: 4dec3e456c9e
+Revises: e6227073183d
+Create Date: 2025-01-21 08:20:12.221051+00:00
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '4dec3e456c9e'
+down_revision: Union[str, None] = 'e6227073183d'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+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("ALTER TABLE prompts RENAME TO _prompts_old;")
+    op.execute(
+        """
+        CREATE TABLE prompts (
+            id TEXT PRIMARY KEY,  -- UUID stored as TEXT
+            timestamp DATETIME NOT NULL,
+            provider TEXT,       -- VARCHAR(255)
+            request TEXT NOT NULL,  -- Record the full request that arrived to the server
+            type TEXT NOT NULL, -- VARCHAR(50) (e.g. "fim", "chat")
+            workspace_id TEXT NOT NULL,
+            FOREIGN KEY (workspace_id) REFERENCES workspaces(id) ON DELETE CASCADE
+        );
+        """
+    )
+    op.execute("INSERT INTO prompts SELECT * FROM _prompts_old;")
+    op.execute("DROP TABLE _prompts_old;")
+
+    # Doing the same for the sessions table
+    op.execute("ALTER TABLE sessions RENAME TO _sessions_old;")
+    op.execute(
+        """
+        CREATE TABLE sessions (
+            id TEXT PRIMARY KEY,  -- UUID stored as TEXT
+            active_workspace_id TEXT NOT NULL,
+            last_update DATETIME NOT NULL,
+            FOREIGN KEY (active_workspace_id) REFERENCES workspaces(id) ON DELETE CASCADE
+        );
+        """
+    )
+    op.execute("INSERT INTO sessions SELECT * FROM _sessions_old;")
+    op.execute("DROP TABLE _sessions_old;")
+
+    # Doing the same for the output table
+    op.execute("ALTER TABLE outputs RENAME TO _outputs_old;")
+    op.execute(
+        """
+        CREATE TABLE outputs (
+            id TEXT PRIMARY KEY,  -- UUID stored as TEXT
+            prompt_id TEXT NOT NULL,
+            timestamp DATETIME NOT NULL,
+            output TEXT NOT NULL,   -- Record the full response. If stream will be a list of objects
+            FOREIGN KEY (prompt_id) REFERENCES prompts(id) ON DELETE CASCADE
+        );
+        """
+    )
+    op.execute("INSERT INTO outputs SELECT * FROM _outputs_old;")
+    op.execute("DROP TABLE _outputs_old;")
+
+    # Doing the same for the alerts table
+    op.execute("ALTER TABLE alerts RENAME TO _alerts_old;")
+    op.execute(
+        """
+        CREATE TABLE alerts (
+            id TEXT PRIMARY KEY,  -- UUID stored as TEXT
+            prompt_id TEXT NOT NULL,
+            code_snippet TEXT,
+            trigger_string TEXT, -- VARCHAR(255)
+            trigger_type TEXT NOT NULL,   -- VARCHAR(50)
+            trigger_category TEXT,
+            timestamp DATETIME NOT NULL,
+            FOREIGN KEY (prompt_id) REFERENCES prompts(id) ON DELETE CASCADE
+        );
+        """
+    )
+    op.execute("INSERT INTO alerts SELECT * FROM _alerts_old;")
+    op.execute("DROP TABLE _alerts_old;")
+
+    # Dropping unused table
+    op.execute("DROP TABLE settings;")
+
+    # Create indexes for foreign keys
+    op.execute("CREATE INDEX idx_outputs_prompt_id ON outputs(prompt_id);")
+    op.execute("CREATE INDEX idx_alerts_prompt_id ON alerts(prompt_id);")
+    op.execute("CREATE INDEX idx_prompts_workspace_id ON prompts (workspace_id);")
+    op.execute("CREATE INDEX idx_sessions_workspace_id ON sessions (active_workspace_id);")
+
+
+def downgrade() -> None:
+    # Settings table
+    op.execute(
+        """
+        CREATE TABLE settings (
+            id TEXT PRIMARY KEY,  -- UUID stored as TEXT
+            ip TEXT,             -- VARCHAR(45)
+            port INTEGER,
+            llm_model TEXT,      -- VARCHAR(255)
+            system_prompt TEXT,
+            other_settings TEXT  -- JSON stored as TEXT
+        );
+        """
+    )