Improve log upload handling

app/config.py

@@ -2,11 +2,25 @@ import os
 from pathlib import Path
 
 
+def _get_max_content_length() -> int:
+    """Resolve the upload size limit from environment settings."""
+    upload_limit_mb = os.environ.get("MAX_UPLOAD_SIZE_MB")
+    if upload_limit_mb:
+        return int(upload_limit_mb) * 1024 * 1024
+
+    max_content_length = os.environ.get("MAX_CONTENT_LENGTH")
+    if max_content_length:
+        return int(max_content_length)
+
+    return 100 * 1024 * 1024
+
+
 class Config:
     """Default configuration for local and container usage."""
 
     SECRET_KEY = os.environ.get("SECRET_KEY", "dev-secret-key-change-me")
-    MAX_CONTENT_LENGTH = int(os.environ.get("MAX_CONTENT_LENGTH", 10 * 1024 * 1024))
+    # Default to 100 MiB so larger WAF exports can be processed without tuning.
+    MAX_CONTENT_LENGTH = _get_max_content_length()
     PREVIEW_RECORD_LIMIT = int(os.environ.get("PREVIEW_RECORD_LIMIT", 5))
     OUTPUT_DIRECTORY = Path(
         os.environ.get("OUTPUT_DIRECTORY", Path("instance") / "outputs")