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

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

db-migrations-flyway-liquibase/src/test/java/com/ankurm/dbmigrations/Transcript.java

@@ -0,0 +1,62 @@
+package com.ankurm.dbmigrations;
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.time.Instant;
+
+/**
+ * Writes a named transcript under {@code docs/output/} while the test that produced it runs.
+ * Every console-line quoted in the companion article for this module comes from one of these
+ * files, and the file is only ever written by a test assertion — never hand-typed.
+ *
+ * See docs/15-production-checklist.md for how this module's real output is regenerated.
+ */
+public final class Transcript {
+
+    private static final Path OUTPUT_DIR = Paths.get("docs", "output");
+
+    private final StringBuilder buffer = new StringBuilder();
+    private final String name;
+
+    private Transcript(String name) {
+        this.name = name;
+    }
+
+    public static Transcript start(String name, String heading) {
+        Transcript t = new Transcript(name);
+        t.line("=".repeat(Math.min(78, heading.length() + 4)));
+        t.line(heading);
+        t.line("=".repeat(Math.min(78, heading.length() + 4)));
+        t.line("captured: " + Instant.now());
+        t.line("");
+        return t;
+    }
+
+    public Transcript line(String text) {
+        buffer.append(text).append(System.lineSeparator());
+        System.out.println(text);
+        return this;
+    }
+
+    public Transcript section(String title) {
+        line("");
+        line("-- " + title + " --");
+        return this;
+    }
+
+    public void write() {
+        try {
+            Files.createDirectories(OUTPUT_DIR);
+            Path target = OUTPUT_DIR.resolve(name + ".txt");
+            Files.writeString(target, buffer.toString(), StandardOpenOption.CREATE,
+                    StandardOpenOption.TRUNCATE_EXISTING);
+        }
+        catch (IOException ex) {
+            throw new UncheckedIOException(ex);
+        }
+    }
+}