fix(database): skip credential pattern validation for unchanged values

Pattern enforcement now conditional on field being dirty (changed vs
saved value). Prevents false validation failures when existing records
hold legacy credential formats that pre-date the stricter regex rules.

tests/Unit/DatabaseCredentialDirtyValidationTest.php

@@ -0,0 +1,87 @@
+<?php
+
+use App\Support\ValidationPatterns;
+
+// ── databasePasswordRules ─────────────────────────────────────────────────────
+
+it('databasePasswordRules includes regex rule by default', function () {
+    $rules = ValidationPatterns::databasePasswordRules();
+
+    $regexRules = array_filter($rules, fn ($rule) => str_starts_with($rule, 'regex:'));
+    expect($regexRules)->not->toBeEmpty();
+});
+
+it('databasePasswordRules includes regex rule when enforcePattern true', function () {
+    $rules = ValidationPatterns::databasePasswordRules(enforcePattern: true);
+
+    $regexRules = array_filter($rules, fn ($rule) => str_starts_with($rule, 'regex:'));
+    expect($regexRules)->not->toBeEmpty();
+});
+
+it('databasePasswordRules omits regex rule when enforcePattern false', function () {
+    $rules = ValidationPatterns::databasePasswordRules(enforcePattern: false);
+
+    $regexRules = array_filter($rules, fn ($rule) => str_starts_with($rule, 'regex:'));
+    expect($regexRules)->toBeEmpty();
+});
+
+it('databasePasswordRules keeps required, string, min and max when enforcePattern false', function () {
+    $rules = ValidationPatterns::databasePasswordRules(required: true, minLength: 1, maxLength: 128, enforcePattern: false);
+
+    expect($rules)->toContain('required');
+    expect($rules)->toContain('string');
+    expect($rules)->toContain('min:1');
+    expect($rules)->toContain('max:128');
+});
+
+it('databasePasswordRules keeps nullable and bounds when not required and enforcePattern false', function () {
+    $rules = ValidationPatterns::databasePasswordRules(required: false, minLength: 2, maxLength: 64, enforcePattern: false);
+
+    expect($rules)->toContain('nullable');
+    expect($rules)->toContain('string');
+    expect($rules)->toContain('min:2');
+    expect($rules)->toContain('max:64');
+    expect(array_filter($rules, fn ($rule) => str_starts_with($rule, 'regex:')))->toBeEmpty();
+});
+
+// ── databaseIdentifierRules ───────────────────────────────────────────────────
+
+it('databaseIdentifierRules includes regex rule by default', function () {
+    $rules = ValidationPatterns::databaseIdentifierRules();
+
+    $regexRules = array_filter($rules, fn ($rule) => str_starts_with($rule, 'regex:'));
+    expect($regexRules)->not->toBeEmpty();
+});
+
+it('databaseIdentifierRules includes regex rule when enforcePattern true', function () {
+    $rules = ValidationPatterns::databaseIdentifierRules(enforcePattern: true);
+
+    $regexRules = array_filter($rules, fn ($rule) => str_starts_with($rule, 'regex:'));
+    expect($regexRules)->not->toBeEmpty();
+});
+
+it('databaseIdentifierRules omits regex rule when enforcePattern false', function () {
+    $rules = ValidationPatterns::databaseIdentifierRules(enforcePattern: false);
+
+    $regexRules = array_filter($rules, fn ($rule) => str_starts_with($rule, 'regex:'));
+    expect($regexRules)->toBeEmpty();
+});
+
+it('databaseIdentifierRules keeps required, string, min and max when enforcePattern false', function () {
+    $rules = ValidationPatterns::databaseIdentifierRules(required: true, minLength: 1, maxLength: 63, enforcePattern: false);
+
+    expect($rules)->toContain('required');
+    expect($rules)->toContain('string');
+    expect($rules)->toContain('min:1');
+    expect($rules)->toContain('max:63');
+});
+
+it('databaseIdentifierRules keeps nullable and bounds when not required and enforcePattern false', function () {
+    $rules = ValidationPatterns::databaseIdentifierRules(required: false, minLength: 1, maxLength: 30, enforcePattern: false);
+
+    expect($rules)->toContain('nullable');
+    expect($rules)->toContain('string');
+    expect($rules)->toContain('min:1');
+    expect($rules)->toContain('max:30');
+    expect(array_filter($rules, fn ($rule) => str_starts_with($rule, 'regex:')))->toBeEmpty();
+});