diff --git a/alembic/versions/0052_clear_note_embeddings_for_fastembed.py b/alembic/versions/0052_clear_note_embeddings_for_fastembed.py
new file mode 100644
index 0000000..e60eac0
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+++ b/alembic/versions/0052_clear_note_embeddings_for_fastembed.py
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+"""clear note_embeddings for fastembed swap
+
+Revision ID: 0052
+Revises: 0051
+Create Date: 2026-05-26
+
+Embeddings stored in `note_embeddings.embedding` (JSONB) were generated by
+Ollama's nomic-embed-text model (768-dim). The fastembed swap uses
+BAAI/bge-small-en-v1.5 (384-dim). Mixed-dim vectors would break the
+Python-side cosine similarity (length mismatch), so we wipe the table.
+
+The startup hook `services.embeddings.backfill_note_embeddings` regenerates
+everything at the new dimension on next boot. There's no column-type change
+because the column is JSONB — dimensionless on the storage side.
+
+Downgrade is the same operation: a fresh deployment of the prior code would
+backfill with the old model. No data is lost that the next boot won't restore.
+"""
+from alembic import op
+
+
+revision = "0052"
+down_revision = "0051"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.execute("DELETE FROM note_embeddings")
+
+
+def downgrade() -> None:
+    op.execute("DELETE FROM note_embeddings")