fix: events silently dropped when message is an object (sentry-dart/Flutter SDK)

[ajianaz]

Root cause

The Event struct declared message as Option<String>, but modern Sentry SDKs (Dart/Flutter, JS, Python, etc.) send the Message interface as an object, not a plain string:

"message": { "formatted": "Null check operator used on a null value", "message": "%s" }

serde failed with invalid type: map, expected a string and — because the envelope parser used if let Ok(...) and silently discarded the Err — the entire event was dropped with zero log output.

Reproduced against production logs

Real sentry-flutter envelopes hit the server but always parsed to zero:

INFO Ingest request: project_id=5cbd1ec7-... body_len=3425
INFO Encoding: Some("gzip")
INFO Parsed 0 events, 0 transactions     ← event silently dropped

A diagnostic test confirmed the exact serde error:

Event deserialize ERROR: invalid type: map, expected a string at line 1 column 171

column 171 = the message field.

Fix

1. trapfall-proto — deserialize_message()
Custom deserializer on Event.message that accepts both forms and collapses to the display string:

• plain string → as-is
• object → formatted (preferred), falling back to message
• other → None

2. trapfall-ingest — stop swallowing errors
Replaced every if let Ok(...) silent drop with explicit match arms that tracing::warn! the item type + error. Unknown item types now tracing::debug! instead of vanishing. Future field mismatches will surface in logs.

Tests

• parse_event_message_as_object_sentry_dart_format — the regression
• parse_event_message_object_falls_back_to_message_key — formatted absent

Verification

• cargo fmt --all -- --check → clean
• cargo clippy --workspace --all-targets → clean
• cargo test --workspace → all pass (incl. 2 new)

Impact

Events from sentry-dart/Flutter (and any SDK using the Message object form) now land in TrapFall. This was the actual cause of the user's "data tidak masuk" report — not Cloudflare (confirmed: no CF events, requests reached the server).