Introduced groups and added all related endpoints

alembic/versions/0a455608256f_add_groups_table_and_migrate_group_.py

@@ -0,0 +1,110 @@
+"""add groups table and migrate group_title data
+
+Revision ID: 0a455608256f
+Revises: 95b61a92455a
+Create Date: 2025-06-10 09:22:11.820035
+
+"""
+import uuid
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '0a455608256f'
+down_revision: Union[str, None] = '95b61a92455a'
+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! ###
+    op.create_table('groups',
+    sa.Column('id', sa.UUID(), nullable=False),
+    sa.Column('name', sa.String(), nullable=False),
+    sa.Column('sort_order', sa.Integer(), nullable=False, server_default='0'),
+    sa.Column('created_at', sa.DateTime(), server_default=sa.text('now()'), nullable=True),
+    sa.Column('updated_at', sa.DateTime(), server_default=sa.text('now()'), nullable=True),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('name')
+    )
+
+    # Create temporary table for group mapping
+    group_mapping = op.create_table(
+        'group_mapping',
+        sa.Column('group_title', sa.String(), nullable=False),
+        sa.Column('group_id', sa.UUID(), nullable=False)
+    )
+
+    # Get existing group titles and create groups
+    conn = op.get_bind()
+    distinct_groups = conn.execute(
+        sa.text("SELECT DISTINCT group_title FROM channels")
+    ).fetchall()
+
+    for group in distinct_groups:
+        group_title = group[0]
+        group_id = str(uuid.uuid4())
+        conn.execute(
+            sa.text(
+                "INSERT INTO groups (id, name, sort_order) "
+                "VALUES (:id, :name, 0)"
+            ).bindparams(id=group_id, name=group_title)
+        )
+        conn.execute(
+            group_mapping.insert().values(
+                group_title=group_title,
+                group_id=group_id
+            )
+        )
+
+    # Add group_id column (nullable first)
+    op.add_column('channels', sa.Column('group_id', sa.UUID(), nullable=True))
+
+    # Update channels with group_ids
+    conn.execute(
+        sa.text(
+            "UPDATE channels c SET group_id = gm.group_id "
+            "FROM group_mapping gm WHERE c.group_title = gm.group_title"
+        )
+    )
+
+    # Now make group_id non-nullable and add constraints
+    op.alter_column('channels', 'group_id', nullable=False)
+    op.drop_constraint(op.f('uix_group_title_name'), 'channels', type_='unique')
+    op.create_unique_constraint('uix_group_id_name', 'channels', ['group_id', 'name'])
+    op.create_foreign_key('fk_channels_group_id', 'channels', 'groups', ['group_id'], ['id'])
+
+    # Clean up and drop group_title
+    op.drop_table('group_mapping')
+    op.drop_column('channels', 'group_title')
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('channels', sa.Column('group_title', sa.VARCHAR(), autoincrement=False, nullable=True))
+    
+    # Restore group_title values from groups table
+    conn = op.get_bind()
+    conn.execute(
+        sa.text(
+            "UPDATE channels c SET group_title = g.name "
+            "FROM groups g WHERE c.group_id = g.id"
+        )
+    )
+    
+    # Now make group_title non-nullable
+    op.alter_column('channels', 'group_title', nullable=False)
+    
+    # Drop constraints and columns
+    op.drop_constraint('fk_channels_group_id', 'channels', type_='foreignkey')
+    op.drop_constraint('uix_group_id_name', 'channels', type_='unique')
+    op.create_unique_constraint(op.f('uix_group_title_name'), 'channels', ['group_title', 'name'])
+    op.drop_column('channels', 'group_id')
+    op.drop_table('groups')
+    # ### end Alembic commands ###