Fix JSON normalization in live SQL import

app/app/Services/LiveSqlImportService.php

@@ -187,7 +187,14 @@ class LiveSqlImportService
         if (isset($this->tableColumnMap[$table])) {
             $mapped = [];
             foreach ($this->tableColumnMap[$table] as $from => $to) {
-                $mapped[$to] = $row[$from] ?? null;
+                $value = $row[$from] ?? null;
+                if ($table === 'licenses' && $to === 'meta_json') {
+                    $value = $this->normalizeJson($value);
+                }
+                if ($table === 'usage_logs' && $to === 'seen_signatures') {
+                    $value = $this->normalizeJson($value);
+                }
+                $mapped[$to] = $value;
             }
 
             if ($table === 'licenses') {
@@ -219,6 +226,19 @@ class LiveSqlImportService
             ];
         }
 
+        if ($table === 'ai_judgments' && isset($row['raw_response'])) {
+            $row['raw_response'] = $this->normalizeJson($row['raw_response']);
+        }
+        if ($table === 'contributor_rewards' && isset($row['meta'])) {
+            $row['meta'] = $this->normalizeJson($row['meta']);
+        }
+        if ($table === 'email_queue' && isset($row['payload'])) {
+            $row['payload'] = $this->normalizeJson($row['payload']);
+        }
+        if ($table === 'user_prefs' && isset($row['preferred_languages'])) {
+            $row['preferred_languages'] = $this->normalizeJson($row['preferred_languages']);
+        }
+
         return $row;
     }
 
@@ -325,4 +345,28 @@ class LiveSqlImportService
             default => $ch,
         };
     }
+
+    private function normalizeJson(mixed $value): ?string
+    {
+        if ($value === null) {
+            return null;
+        }
+
+        if (!is_string($value)) {
+            return json_encode($value);
+        }
+
+        $decoded = json_decode($value, true);
+        if (json_last_error() === JSON_ERROR_NONE) {
+            return json_encode($decoded);
+        }
+
+        $stripped = stripslashes($value);
+        $decoded = json_decode($stripped, true);
+        if (json_last_error() === JSON_ERROR_NONE) {
+            return json_encode($decoded);
+        }
+
+        return null;
+    }
 }