alembic: add 0021 csv_format_templates

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

alembic/versions/0021_csv_format_template.py

@@ -0,0 +1,40 @@
+"""csv format templates table — LLM-fallback parser cache.
+
+Revision ID: 0021
+Revises: 0020
+Create Date: 2026-05-27
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+
+revision: str = "0021"
+down_revision: Union[str, None] = "0020"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "csv_format_templates",
+        sa.Column("id", sa.BigInteger(), primary_key=True, autoincrement=True),
+        sa.Column("fingerprint", sa.String(length=64), nullable=False),
+        sa.Column("headers", sa.JSON(), nullable=False),
+        sa.Column("sample_row", sa.JSON(), nullable=False),
+        sa.Column("mapping", sa.JSON(), nullable=False),
+        sa.Column("preamble_rows", sa.Integer(), nullable=False, server_default="0"),
+        sa.Column("delimiter", sa.String(length=1), nullable=False, server_default=","),
+        sa.Column("broker_label", sa.String(length=128), nullable=True),
+        sa.Column("first_seen_at", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("use_count", sa.Integer(), nullable=False, server_default="1"),
+        sa.Column("last_used_at", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("llm_model", sa.String(length=64), nullable=True),
+        sa.Column("llm_cost_usd", sa.Float(), nullable=True),
+        sa.UniqueConstraint("fingerprint", name="uq_csv_format_templates_fingerprint"),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("csv_format_templates")