Simplify is_deleted migration: drop column without backup

api/migrations/versions/2025_09_02_2012-4f02b6704509_remove_unused_is_deleted_field_from_.py

@@ -4,13 +4,11 @@ Revision ID: 4f02b6704509
 Revises: 7bb281b7a422
 Create Date: 2025-09-02 20:12:37.311318
 
-This migration runs on both PostgreSQL and MySQL. It uses SQLAlchemy
-expressions instead of raw SQL so dialects handle boolean literals.
+This migration runs on both PostgreSQL and MySQL.
 """
 from alembic import op
 import models as models
 import sqlalchemy as sa
-from sqlalchemy import inspect
 
 
 # revision identifiers, used by Alembic.
@@ -19,35 +17,8 @@ down_revision = '7bb281b7a422'
 branch_labels = None
 depends_on = None
 
-# Backup table name for soft-deleted conversations
-backup_table_name = 'conversations_4f02b6704509_bak'
-
-
 def upgrade():
     # ### commands auto generated by Alembic - please adjust! ###
-    bind = op.get_bind()
-    metadata = sa.MetaData()
-    conversations = sa.Table('conversations', metadata, autoload_with=bind)
-
-    # Drop leftover backup table if it exists (idempotent reruns)
-    inspector = inspect(bind)
-    if backup_table_name in inspector.get_table_names():
-        op.drop_table(backup_table_name)
-
-    # Create backup table with identical schema
-    op.create_table(backup_table_name, *[col.copy() for col in conversations.columns])
-    backup_table = sa.Table(backup_table_name, metadata, autoload_with=bind)
-
-    # Copy soft-deleted rows into backup
-    insert_backup = sa.insert(backup_table).from_select(
-        conversations.columns.keys(),
-        sa.select(*conversations.c).where(conversations.c.is_deleted.is_(sa.true())),
-    )
-    bind.execute(insert_backup)
-
-    # Delete soft-deleted rows from main table
-    bind.execute(sa.delete(conversations).where(conversations.c.is_deleted.is_(sa.true())))
-
     with op.batch_alter_table('conversations', schema=None) as batch_op:
         batch_op.drop_column('is_deleted')
 
@@ -59,21 +30,4 @@ def downgrade():
     with op.batch_alter_table('conversations', schema=None) as batch_op:
         batch_op.add_column(sa.Column('is_deleted', sa.BOOLEAN(), server_default=sa.text('false'), autoincrement=False, nullable=False))
 
-    # Restore soft-deleted conversations from backup table if it exists
-    bind = op.get_bind()
-    metadata = sa.MetaData()
-    inspector = inspect(bind)
-
-    if backup_table_name in inspector.get_table_names():
-        conversations = sa.Table('conversations', metadata, autoload_with=bind)
-        backup_table = sa.Table(backup_table_name, metadata, autoload_with=bind)
-
-        restore_stmt = sa.insert(conversations).from_select(
-            conversations.columns.keys(),
-            sa.select(*backup_table.c),
-        )
-        bind.execute(restore_stmt)
-
-        op.drop_table(backup_table_name)
-
     # ### end Alembic commands ###