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+# 2026-03-01 Session Notes
+
+## Incremental Embedding Refresh Tracker Implementation Plan
+
+Received detailed plan for implementing a background polling loop to detect and refresh stale/missing embeddings in the Signet memory pipeline. The tracker runs independently and processes embeddings in small batches to avoid overwhelming the system.
+
+### Architecture Decisions
+
+The tracker uses a **setTimeout chain** instead of setInterval for natural backpressure — each cycle schedules the next after current processing completes, rather than on a fixed timer. This prevents queue buildup if embedding fetches slow down.
+
+### Core Mechanism
+
+Polling loop:
+1. Check embedding provider health (uses existing 30s cache)
+2. Query stale embeddings: missing embeddings, content hash mismatches, or model drift
+3. Fetch embeddings sequentially with 30s timeout per request
+4. Batch write successful results in single transaction
+5. Idempotent via `ON CONFLICT(content_hash) DO UPDATE`
+
+### Configuration
+
+Three parameters in `PipelineEmbeddingTrackerConfig`:
+- `enabled` (boolean, default true)
+- `pollMs` (5000ms default, clamped 1000–60000ms)
+- `batchSize` (8 default, clamped 1–20)
+
+### Integration Points
+
+1. **types.ts** — Add `PipelineEmbeddingTrackerConfig` interface to `PipelineV2Config`
+2. **memory-config.ts** — Parse tracker config using existing `clampPositive` pattern
+3. **embedding-tracker.ts** (new ~200 LOC) — Core polling module with graceful shutdown
+4. **daemon.ts** — Start tracker after pipeline init, stop before DB cleanup, enhance `/api/embeddings/status` endpoint
+
+### Edge Cases Handled
+
+Race conditions on concurrent remember/update (idempotent write), provider downtime (retries next cycle), model switching (old embeddings deleted by hash), large backlogs (intentional backpressure at ~100/min), empty DB (returns immediately).
+
+### Next Steps
+
+Implementation in order: types → memory-config → new embedding-tracker module → daemon wiring. Verification via build, typecheck, lint, then manual testing with stale embeddings.
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