Initial extraction from monorepo

alembic/versions/0001_initial.py

@@ -0,0 +1,85 @@
+"""Create hmrc_sync.tax_year_snapshot + hmrc_sync.fetch_log.
+
+These two tables hold everything hmrc-sync persists. The snapshot table
+keeps HMRC's `hmrc-held` PAYE/NI view per (tax_year, employer, day);
+fetch_log is the audit trail of every outbound API call (for
+fraud-header compliance reviews HMRC may trigger).
+"""
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+from alembic import op
+
+revision = "0001"
+down_revision = None
+branch_labels = None
+depends_on = None
+
+SCHEMA = "hmrc_sync"
+
+
+def upgrade() -> None:
+    op.create_table(
+        "tax_year_snapshot",
+        sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
+        sa.Column("tax_year", sa.String(), nullable=False),
+        sa.Column("employer_paye_ref", sa.String(), nullable=False),
+        sa.Column("snapshot_date", sa.TIMESTAMP(timezone=True), nullable=False),
+        sa.Column("gross_pay", sa.Numeric(12, 2), nullable=False),
+        sa.Column("income_tax", sa.Numeric(12, 2), nullable=False),
+        sa.Column("ni_contributions", sa.Numeric(12, 2), nullable=False),
+        sa.Column("source", sa.String(), nullable=False, server_default="hmrc-held"),
+        sa.Column(
+            "raw_response",
+            postgresql.JSONB().with_variant(sa.JSON(), "sqlite"),
+            nullable=False,
+        ),
+        sa.Column(
+            "fetched_at",
+            sa.TIMESTAMP(timezone=True),
+            nullable=False,
+            server_default=sa.text("now()"),
+        ),
+        sa.UniqueConstraint(
+            "tax_year",
+            "employer_paye_ref",
+            "snapshot_date",
+            name="uq_tax_year_snapshot",
+        ),
+        schema=SCHEMA,
+    )
+    op.create_index(
+        "ix_tax_year_snapshot_tax_year",
+        "tax_year_snapshot",
+        ["tax_year"],
+        schema=SCHEMA,
+    )
+
+    op.create_table(
+        "fetch_log",
+        sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
+        sa.Column("endpoint", sa.String(), nullable=False),
+        sa.Column("status_code", sa.Integer(), nullable=False),
+        sa.Column("request_id", sa.String(), nullable=True),
+        sa.Column("correlation_id", sa.String(), nullable=True),
+        sa.Column(
+            "fraud_headers_sent",
+            postgresql.JSONB().with_variant(sa.JSON(), "sqlite"),
+            nullable=False,
+        ),
+        sa.Column("response_snippet", sa.String(), nullable=True),
+        sa.Column("duration_ms", sa.Integer(), nullable=False),
+        sa.Column(
+            "fetched_at",
+            sa.TIMESTAMP(timezone=True),
+            nullable=False,
+            server_default=sa.text("now()"),
+        ),
+        schema=SCHEMA,
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("fetch_log", schema=SCHEMA)
+    op.drop_index("ix_tax_year_snapshot_tax_year", table_name="tax_year_snapshot", schema=SCHEMA)
+    op.drop_table("tax_year_snapshot", schema=SCHEMA)