task: DEEPSEEK-28A - investigate dBug-027 /ingest 500 error

Direct /ingest calls fail silently (HTTP 500, not logged).
Likely in Class C routing code added by DEEPSEEK-27.

Need: exception logging + debug + identification of root cause.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Author: tkalevra

scratch.md

@@ -242,3 +242,44 @@ already `continue`s garbage edges with only `log.debug`.
 **Result:** "tell me about my family" now returns clean facts (no addresses, servers, garbage entities)
 
 ####################################################################
+
+###################################DEEPSEEK-28A##################################
+
+## dBug-027: /ingest Endpoint 500 Error — Silent Failure
+
+**Issue:** Direct `POST http://localhost:8001/ingest` returns HTTP 500. Not logged. No traceback.
+
+**See:** BUGS/dBug-027-ingest-endpoint-500-error.md
+
+**Impact:** dBug-025 complete (Filter works), but direct /ingest testing blocked. Prevents verification of Class C routing.
+
+**Task:** Debug /ingest endpoint failure.
+
+**Steps:**
+1. Add exception logging to /ingest endpoint (wrap main body in try/except)
+2. Check `_commit_rejected_edge_to_qdrant()` for unhandled exceptions
+3. Check `_get_rejection_reason()` for issues
+4. Test with minimal ingest (no garbage) to isolate
+5. Report error + location to scratch
+
+**Upon completion:** Fill template below
+
+####################################################################
+
+## Upon Completion Template
+
+###################################DEEPSEEK-28A##################################
+
+## dBug-027 Investigation Complete
+
+**Error found:** [Describe the exception + location]
+
+**Root cause:** [Why it was silent + where it fails]
+
+**Files affected:** [main.py lines X-Y]
+
+**Fix applied:** [If applicable]
+
+**Status:** [Resolved / Blocked / Needs clarification]
+
+####################################################################