Add migration-5-to-7 module: Hibernate 5.6.15 vs 7.4.14 jar diff, compile checks, schema defaults and cheat-sheet snippets

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01YPgGH6aMbSLANL3E2HHmS6

migration-5-to-7/scripts/schema_diff.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+"""Lines up output/06-schema-5.6.15.txt and output/06-schema-7.4.14.txt side by side into output/06-schema-diff.txt."""
+import pathlib
+
+OUT = pathlib.Path(__file__).resolve().parent.parent / "output"
+
+
+def read(version):
+    seq, cols, section = {}, {}, None
+    for line in (OUT / f"06-schema-{version}.txt").read_text().splitlines():
+        if line.startswith("-- sequences"):
+            section = "seq"
+        elif line.startswith("-- columns"):
+            section = "col"
+        elif section == "seq":
+            name, inc = line.rsplit(" ", 1)
+            seq[name] = inc
+        elif section == "col":
+            name, typ = line.split(" ", 1)
+            cols[name] = typ
+    return seq, cols
+
+
+s5, c5 = read("5.6.15")
+s7, c7 = read("7.4.14")
+rows = [f"{'':<14}{'Hibernate 5.6.15':<26}{'Hibernate 7.4.14':<26}", "-- id sequences (name, increment)"]
+rows.append(f"{'':<14}{', '.join(f'{k} {v}' for k, v in s5.items()):<26}{', '.join(f'{k} {v}' for k, v in s7.items())}")
+rows.append("-- column types in H2")
+for name in sorted(set(c5) | set(c7)):
+    a, b = c5.get(name, "-"), c7.get(name, "-")
+    rows.append(f"{name:<14}{a:<26}{b:<26}{'(same)' if a == b else '<-- differs'}")
+(OUT / "06-schema-diff.txt").write_text("\n".join(rows) + "\n")
+print("\n".join(rows))