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backend/alembic/versions/58fc464be769_trade_proposals_multi_requested_cards.py

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+"""trade_proposals_multi_requested_cards
+
+Revision ID: 58fc464be769
+Revises: cfac344e21b4
+Create Date: 2026-03-28 22:09:44.129838
+
+Replace single requested_card_id FK with requested_card_ids JSONB array so proposals
+can request zero or more cards, mirroring the real-time trade system's flexibility.
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+
+# revision identifiers, used by Alembic.
+revision: str = '58fc464be769'
+down_revision: Union[str, Sequence[str], None] = 'cfac344e21b4'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Add the new column, migrate existing data, then drop the old column
+    op.add_column('trade_proposals',
+        sa.Column('requested_card_ids', postgresql.JSONB(astext_type=sa.Text()), nullable=True)
+    )
+    # Migrate any existing rows: wrap the single FK UUID into a JSON array
+    op.execute("""
+        UPDATE trade_proposals
+        SET requested_card_ids = json_build_array(requested_card_id::text)::jsonb
+        WHERE requested_card_id IS NOT NULL
+    """)
+    op.execute("""
+        UPDATE trade_proposals
+        SET requested_card_ids = '[]'::jsonb
+        WHERE requested_card_ids IS NULL
+    """)
+    op.alter_column('trade_proposals', 'requested_card_ids', nullable=False)
+    op.drop_constraint('trade_proposals_requested_card_id_fkey', 'trade_proposals', type_='foreignkey')
+    op.drop_column('trade_proposals', 'requested_card_id')
+
+
+def downgrade() -> None:
+    op.add_column('trade_proposals',
+        sa.Column('requested_card_id', sa.UUID(), nullable=True)
+    )
+    # Best-effort reverse: take first element of the array if present
+    op.execute("""
+        UPDATE trade_proposals
+        SET requested_card_id = (requested_card_ids->0)::text::uuid
+        WHERE jsonb_array_length(requested_card_ids) > 0
+    """)
+    op.drop_column('trade_proposals', 'requested_card_ids')