-- pg_trickle 0.52.0 -> 0.53.0 upgrade migration
--
-- v0.53.0 — Unit Test Depth Sweep
--
-- This release contains no SQL schema changes. All changes are
-- internal test coverage improvements and test reliability fixes:
--
--   T-2: Unit tests added to scheduler/dispatch.rs
--        (parse_worker_extra, compute_adaptive_poll_ms, ParallelDispatchState)
--   T-4: Unit tests added to scheduler/pool.rs, watermark.rs, citus.rs,
--        scheduler_loop.rs (pure-helper extraction + inline test modules)
--   T-6: Unit tests added to dvm/parser/sublinks.rs
--        (22 tests: extract_bare_scalar_subquery_sql, is_known_aggregate,
--        is_star_only, rewrite_having_expr, split_exists_correlation,
--        collect_tree_source_aliases)
--   T-8: Proptest coverage extended in dag.rs
--        (4 property-based tests: acyclic chains, back-edge cycles,
--        topological order, single back-edge cycle)
--   T-9: Fixed sleeps replaced with adaptive polling in e2e_buffer_growth_tests.rs