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.

app/Support/ValidationPatterns.php

@@ -82,8 +82,12 @@ class ValidationPatterns
 
     /**
      * Get validation rules for database identifier fields (username, database name).
+     *
+     * Set $enforcePattern to false to skip the regex check (for example when
+     * re-validating a legacy value on an existing record that has not been
+     * changed by the user). The length and type rules are always applied.
      */
-    public static function databaseIdentifierRules(bool $required = true, int $minLength = 1, int $maxLength = 63): array
+    public static function databaseIdentifierRules(bool $required = true, int $minLength = 1, int $maxLength = 63, bool $enforcePattern = true): array
     {
         $rules = [];
 
@@ -96,7 +100,10 @@ class ValidationPatterns
         $rules[] = 'string';
         $rules[] = "min:$minLength";
         $rules[] = "max:$maxLength";
-        $rules[] = 'regex:'.self::DB_IDENTIFIER_PATTERN;
+
+        if ($enforcePattern) {
+            $rules[] = 'regex:'.self::DB_IDENTIFIER_PATTERN;
+        }
 
         return $rules;
     }
@@ -117,8 +124,12 @@ class ValidationPatterns
 
     /**
      * Get validation rules for database password fields.
+     *
+     * Set $enforcePattern to false to skip the regex check (for example when
+     * re-validating a legacy value on an existing record that has not been
+     * changed by the user). The length and type rules are always applied.
      */
-    public static function databasePasswordRules(bool $required = true, int $minLength = 1, int $maxLength = 128): array
+    public static function databasePasswordRules(bool $required = true, int $minLength = 1, int $maxLength = 128, bool $enforcePattern = true): array
     {
         $rules = [];
 
@@ -131,7 +142,10 @@ class ValidationPatterns
         $rules[] = 'string';
         $rules[] = "min:$minLength";
         $rules[] = "max:$maxLength";
-        $rules[] = 'regex:'.self::DB_PASSWORD_PATTERN;
+
+        if ($enforcePattern) {
+            $rules[] = 'regex:'.self::DB_PASSWORD_PATTERN;
+        }
 
         return $rules;
     }