"""create_task_instances

Revision ID: 0003
Revises: 0002
Create Date: 2026-03-26

"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op
from sqlalchemy.dialects.postgresql import JSONB

revision: str = "0003"
down_revision: Union[str, Sequence[str], None] = "0002"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "task_instances",
        sa.Column("id", sa.UUID(), nullable=False),
        sa.Column("run_id", sa.UUID(), nullable=False),
        sa.Column("type", sa.Text(), nullable=False),
        sa.Column("params", JSONB(), nullable=False, server_default="{}"),
        sa.Column("status", sa.Text(), nullable=False, server_default="pending"),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.text("now()"),
        ),
        sa.ForeignKeyConstraint(
            ["run_id"],
            ["activity_runs.run_id"],
            ondelete="CASCADE",
        ),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index("ix_task_instances_run_id", "task_instances", ["run_id"])


def downgrade() -> None:
    op.drop_index("ix_task_instances_run_id", table_name="task_instances")
    op.drop_table("task_instances")