update

backend/core/migrations/versions/0007_ai_embed_1024.py

@@ -0,0 +1,28 @@
+"""ai_core: change embedding dim from 768 to 1024 (bge-m3)
+
+Revision ID: 0007_embed1024
+Revises: 0006_ai_core
+Create Date: 2026-04-17
+
+"""
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0007_embed1024"
+down_revision: str | None = "0006_ai_core"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    # Drop and recreate with new dimension — truncating old embeddings is fine,
+    # reindex will rebuild them.
+    op.execute("DELETE FROM ai_documents")
+    op.execute("ALTER TABLE ai_documents ALTER COLUMN embedding TYPE vector(1024)")
+
+
+def downgrade() -> None:
+    op.execute("DELETE FROM ai_documents")
+    op.execute("ALTER TABLE ai_documents ALTER COLUMN embedding TYPE vector(768)")