-- pg_trickle 0.25.0 → 0.26.0 upgrade migration
-- ============================================
--
-- v0.26.0 — Test & Concurrency Hardening
--
-- All changes in this release are code-only (no SQL schema changes):
--
-- CONC-1: Simultaneous ALTER + REFRESH E2E test (code-only)
-- CONC-2: Simultaneous DROP + REFRESH E2E test (code-only)
-- CONC-3: Parallel-worker duplicate-pick E2E test (code-only)
-- CONC-4: Concurrent canary promotion race E2E test (code-only)
-- SLA-1:  Predictive cost model accuracy harness (code-only)
-- SLA-2:  SLA tier oscillation damping with hysteresis (code-only)
-- SLA-3:  SLA tier oscillation property test (code-only)
-- FUZZ-1: Cron parser fuzz target (code-only)
-- FUZZ-2: GUC string→enum fuzz target (code-only)
-- FUZZ-3: CDC trigger payload fuzz target (code-only)
-- SCALE-1: Partition-count scale test (code-only)
-- SCALE-2: Multi-DB worker starvation test (code-only)
-- ARCH-1B: Refresh sub-module migration (code-only)
--   - src/refresh/orchestrator.rs: RefreshAction, determine_refresh_action,
--     cost model, execute_reinitialize_refresh
--   - src/refresh/codegen.rs: SQL template builders, MERGE SQL cache,
--     planner hints, change-buffer cleanup, ST-to-ST delta capture
--   - src/refresh/merge.rs: execute_differential_refresh, execute_full_refresh,
--     execute_topk_refresh, execute_no_data_refresh, partition helpers
--   - src/refresh/mod.rs: reduced to <500 LOC (re-exports + shared types)
-- ERR-1: Typed DiagnosticError variant (code-only)
-- ERR-2: Typed PublicationError variant (code-only)
-- ERR-3: Scheduler timestamp errors with HINT (code-only)
-- ERR-4: Crash-recovery E2E test for publication downstream (code-only)
--
-- No SQL schema objects were added, modified, or removed in this release.
-- This file is intentionally empty beyond this comment block.