-- GIN indexes for JSONB path queries on students/teachers
CREATE INDEX IF NOT EXISTS idx_clazz_students_gin ON clazz USING gin (students jsonb_path_ops);
CREATE INDEX IF NOT EXISTS idx_clazz_teachers_gin ON clazz USING gin (teachers jsonb_path_ops);

-- Composite index for date range + is_repeat filter
CREATE INDEX IF NOT EXISTS idx_clazz_date_active ON clazz (is_repeat, start_from, end_by);

-- Indexes on clazz_repeat for join queries
CREATE INDEX IF NOT EXISTS idx_clazz_repeat_clazz_id ON clazz_repeat (clazz_id);
CREATE INDEX IF NOT EXISTS idx_clazz_repeat_date_range ON clazz_repeat (repeat_start, repeat_end);