Add chat_comments table migration

surfsense_backend/alembic/versions/66_add_chat_comments_table.py

@@ -0,0 +1,46 @@
+"""Add chat_comments table for comments on AI responses
+
+Revision ID: 66
+Revises: 65
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+
+revision: str = "66"
+down_revision: str | None = "65"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    """Create chat_comments table."""
+    op.execute(
+        """
+        CREATE TABLE IF NOT EXISTS chat_comments (
+            id SERIAL PRIMARY KEY,
+            message_id INTEGER NOT NULL REFERENCES new_chat_messages(id) ON DELETE CASCADE,
+            parent_id INTEGER REFERENCES chat_comments(id) ON DELETE CASCADE,
+            author_id UUID REFERENCES "user"(id) ON DELETE SET NULL,
+            content TEXT NOT NULL,
+            created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+            updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+        );
+
+        -- Create indexes
+        CREATE INDEX IF NOT EXISTS idx_chat_comments_message_id ON chat_comments(message_id);
+        CREATE INDEX IF NOT EXISTS idx_chat_comments_parent_id ON chat_comments(parent_id);
+        CREATE INDEX IF NOT EXISTS idx_chat_comments_author_id ON chat_comments(author_id);
+        CREATE INDEX IF NOT EXISTS idx_chat_comments_created_at ON chat_comments(created_at);
+        """
+    )
+
+
+def downgrade() -> None:
+    """Drop chat_comments table."""
+    op.execute(
+        """
+        DROP TABLE IF EXISTS chat_comments;
+        """
+    )