"""add shared privacy-bounded rate-limit buckets

Revision ID: a23c8e4d91f0
Revises: f6b9d2c4801a
Create Date: 2026-08-15 23:45:00
"""

from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


revision: str = "a23c8e4d91f0"
down_revision: Union[str, Sequence[str], None] = "f6b9d2c4801a"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "rate_limit_buckets",
        sa.Column("id", sa.String(length=64), nullable=False),
        sa.Column("policy", sa.String(length=128), nullable=False),
        sa.Column("request_count", sa.Integer(), nullable=False),
        sa.Column("window_started_at", sa.DateTime(timezone=True), nullable=False),
        sa.Column("expires_at", sa.DateTime(timezone=True), nullable=False),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            server_default=sa.text("(CURRENT_TIMESTAMP)"),
            nullable=False,
        ),
        sa.Column(
            "updated_at",
            sa.DateTime(timezone=True),
            server_default=sa.text("(CURRENT_TIMESTAMP)"),
            nullable=False,
        ),
        sa.CheckConstraint(
            "request_count >= 1",
            name="ck_rate_limit_buckets_count",
        ),
        sa.CheckConstraint(
            "expires_at > window_started_at",
            name="ck_rate_limit_buckets_window",
        ),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index(
        "ix_rate_limit_buckets_expiry",
        "rate_limit_buckets",
        ["expires_at"],
        unique=False,
    )


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