change database schema for linking table from unique constraint to partial index

2026-07-22 10:17:00 +02:00
parent 65e3e10e13
commit 9a73f27518
2 changed files with 217 additions and 164 deletions
@@ -0,0 +1,47 @@
+"""change unique constraint to partial index for company person linking table
+
+Revision ID: 665259cdfdc0
+Revises: 03d4f000f445
+Create Date: 2026-07-22 10:14:43.889298
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "665259cdfdc0"
+down_revision: Union[str, Sequence[str], None] = "03d4f000f445"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table("zuordnung_personen_unternehmen", schema=None) as batch_op:
+        batch_op.drop_constraint(batch_op.f("uq_un_id_pers_id"), type_="unique")
+        batch_op.create_index(
+            "uq_aktive_zuordnung",
+            ["un_id", "pers_id"],
+            unique=True,
+            sqlite_where=sa.text("gueltig_bis IS NULL"),
+        )
+
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table("zuordnung_personen_unternehmen", schema=None) as batch_op:
+        batch_op.drop_index(
+            "uq_aktive_zuordnung", sqlite_where=sa.text("gueltig_bis IS NULL")
+        )
+        batch_op.create_unique_constraint(
+            batch_op.f("uq_un_id_pers_id"), ["un_id", "pers_id"]
+        )
+
+    # ### end Alembic commands ###