"""Give role-change keyset ordering microsecond precision.

Revision ID: 447
Revises: 446
Create Date: 2026-08-02

The role-change list fixes a traversal at an application-clock timestamp.
MySQL DATETIME(0) rounded every event in the same wall-clock second onto the
same value, so a row committed after page one could still compare below that
snapshot.  DATETIME(6) makes the persisted ordering key match the cursor.
"""

from __future__ import annotations

import sqlalchemy as sa
from sqlalchemy.dialects import mysql

from alembic import op

revision = "447"
down_revision = "446"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.alter_column(
        "hr_lifecycle_events",
        "created_at",
        existing_type=sa.DateTime(),
        type_=mysql.DATETIME(fsp=6),
        existing_nullable=False,
        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
        server_default=sa.text("CURRENT_TIMESTAMP(6)"),
    )


def downgrade() -> None:
    op.alter_column(
        "hr_lifecycle_events",
        "created_at",
        existing_type=mysql.DATETIME(fsp=6),
        type_=sa.DateTime(),
        existing_nullable=False,
        existing_server_default=sa.text("CURRENT_TIMESTAMP(6)"),
        server_default=sa.text("CURRENT_TIMESTAMP"),
    )