Add system_prompt_slug column and migration for prompt overrides

surfsense_backend/alembic/versions/113_add_system_prompt_slug_to_prompts.py

@@ -0,0 +1,36 @@
+"""add system_prompt_slug to prompts
+
+Revision ID: 113
+Revises: 112
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+
+revision: str = "113"
+down_revision: str | None = "112"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    op.execute(
+        "ALTER TABLE prompts ADD COLUMN IF NOT EXISTS system_prompt_slug VARCHAR(100)"
+    )
+    op.execute(
+        "CREATE INDEX IF NOT EXISTS ix_prompts_system_prompt_slug"
+        " ON prompts (system_prompt_slug)"
+    )
+    op.execute(
+        "ALTER TABLE prompts ADD CONSTRAINT uq_prompt_user_system_slug"
+        " UNIQUE (user_id, system_prompt_slug)"
+    )
+
+
+def downgrade() -> None:
+    op.execute(
+        "ALTER TABLE prompts DROP CONSTRAINT IF EXISTS uq_prompt_user_system_slug"
+    )
+    op.execute("DROP INDEX IF EXISTS ix_prompts_system_prompt_slug")
+    op.execute("ALTER TABLE prompts DROP COLUMN IF EXISTS system_prompt_slug")