"""notes full-text search vector

Revision ID: 0005
Revises: 0004
Create Date: 2026-07-20

A generated tsvector column (title weight A, body weight B) + GIN index, so
search is index-backed and always in sync with the row (no trigger to maintain).
"""
from alembic import op

revision = "0005"
down_revision = "0004"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.execute(
        """
        ALTER TABLE notes ADD COLUMN search_vector tsvector
        GENERATED ALWAYS AS (
            setweight(to_tsvector('english', coalesce(title, '')), 'A') ||
            setweight(to_tsvector('english', coalesce(body, '')), 'B')
        ) STORED
        """
    )
    op.execute("CREATE INDEX ix_notes_search ON notes USING GIN (search_vector)")


def downgrade() -> None:
    op.execute("DROP INDEX IF EXISTS ix_notes_search")
    op.execute("ALTER TABLE notes DROP COLUMN IF EXISTS search_vector")