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Add db-migrations-flyway-liquibase: Flyway vs Liquibase migrations, rollbacks and baselines on Spring Boot 4.1

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Companion code for the Flyway vs Liquibase article: checksum validation, out-of-order
and repeatable migrations, baselining an existing schema, Flyway Community's undo/diff/deploy
stubs, concurrent-startup locking for both tools, Liquibase changeset identity and rollback
(auto-generated vs explicit), a verified Liquibase 5.0.3 filename-caching defect, the new
OSS license service, the FSL license change, and running both tools against one database.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Q6XdRjtsp4862EM44T7i9a
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asmhatre
2026-09-15 07:08:57 +00:00
co-authored by Claude Sonnet 5
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| [`caching/`](caching) | [The Spring Cache Abstraction: @Cacheable, @CacheEvict, Key Generators and the Self-Invocation Trap](https://ankurm.com/spring-cache-abstraction-cacheable-cacheevict-self-invocation-trap/) | the self-invocation trap measured four ways, the key collision `SimpleKeyGenerator` makes easy, eviction timing under a thrown exception, a rollback the cache keeps, and where this sits next to Hibernate's L2 cache |
| [`spring-batch/`](spring-batch) | [Spring Batch on Boot 4.1: Jobs, Steps, Chunk Processing and Restartability](https://ankurm.com/) | a job that fails mid-chunk and resumes exactly where it left off across two separate JVMs, skip vs. restart on the same poisoned row, the resourceless job repository that forgets a restart ever happened, and the `chunk(int)` vs `chunk(int, tx)` builder split |
| [`spring-batch-partitioning/`](spring-batch-partitioning) | [Spring Batch Partitioning and Parallel Steps: Scaling a 10-Million-Row Job](https://ankurm.com/) | the real grid-size sweep at 10M and 300K rows (best speedup 1.42x, on 2 cores), `MultiResourcePartitioner` ignoring gridSize entirely, a rejected partition's `StepExecution` stuck at `STARTING` forever, and Spring Batch 6.0's new `JobOperator#recover` unsticking it |
| [`db-migrations-flyway-liquibase/`](db-migrations-flyway-liquibase) | [Flyway vs Liquibase for Spring Boot 4: Migrations, Rollbacks and Baselines](https://ankurm.com/) | Flyway Community's `undo` throwing `FlywayRedgateEditionRequiredException` at runtime, a real Liquibase 5.0.3 filename-caching defect that produces a phantom successful run, Liquibase's 10-second default lock-poll rate versus Flyway's near-instant row lock, the FSL license change and its ASF/Keycloak fallout, and what actually happens when both tools are enabled against one database |
Articles whose text is kept here rather than only on the blog have it under
`<directory>/post/` — `post.md` for the body and `meta.md` for the title, excerpt and