-- Explicit employee assignments for a case. A group is only a picker/context;
-- each selected employee has a separate row.
CREATE TABLE IF NOT EXISTS sag_case_assignees (
    sag_id INTEGER NOT NULL REFERENCES sag_sager(id) ON DELETE CASCADE,
    user_id INTEGER NOT NULL REFERENCES users(user_id) ON DELETE CASCADE,
    assigned_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    assigned_by_user_id INTEGER REFERENCES users(user_id) ON DELETE SET NULL,
    PRIMARY KEY (sag_id, user_id)
);

CREATE INDEX IF NOT EXISTS idx_sag_case_assignees_user
    ON sag_case_assignees(user_id, sag_id);