Arreglo de equivalencias

backend/alembic/versions/f1a2b3c4d5e6_isolate_equivalency_items.py

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+"""isolate equivalency items
+
+Revision ID: f1a2b3c4d5e6
+Revises: e4f5a6b7c8d9
+Create Date: 2026-05-12 17:18:00.000000
+
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "f1a2b3c4d5e6"
+down_revision: Union[str, None] = "e4f5a6b7c8d9"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # 1. Add equivalency_id column
+    op.add_column(
+        'equivalency_items',
+        sa.Column(
+            'equivalency_id',
+            sa.Integer(),
+            sa.ForeignKey('a76.equivalencies.id', ondelete='CASCADE'),
+            nullable=True
+        ),
+        schema='a76'
+    )
+    
+    # 2. Drop old unique constraint
+    # Note: In some DBs we might need to specify the type, but for Postgres 'unique' or 'foreignkey' works.
+    op.drop_constraint('uq_equivalency_item_fields', 'equivalency_items', schema='a76', type_='unique')
+    
+    # 3. Create new unique constraint including equivalency_id
+    op.create_unique_constraint(
+        'uq_equivalency_item_fields',
+        'equivalency_items',
+        ['equivalency_id', 'original_field', 'external_field', 'tenant_id', 'company_id'],
+        schema='a76'
+    )
+    
+    # 4. Increase identifier length in equivalencies table
+    op.alter_column(
+        'equivalencies',
+        'identifier',
+        type_=sa.String(50),
+        existing_type=sa.String(10),
+        schema='a76'
+    )
+
+
+def downgrade() -> None:
+    # 1. Drop new unique constraint
+    op.drop_constraint('uq_equivalency_item_fields', 'equivalency_items', schema='a76', type_='unique')
+    
+    # 2. Re-create old unique constraint
+    op.create_unique_constraint(
+        'uq_equivalency_item_fields',
+        'equivalency_items',
+        ['original_field', 'external_field', 'tenant_id', 'company_id'],
+        schema='a76'
+    )
+    
+    # 4. Revert identifier length in equivalencies table
+    op.alter_column(
+        'equivalencies',
+        'identifier',
+        type_=sa.String(10),
+        existing_type=sa.String(50),
+        schema='a76'
+    )
+    # 5. Drop equivalency_id column
+    op.drop_column('equivalency_items', 'equivalency_id', schema='a76')