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Closes #827. ## Problem `/api/packets/{hash}` only consulted the in-memory `PacketStore`. When a packet aged out of memory, the handler 404'd — even though SQLite still had it and `/api/nodes/{pubkey}` `recentAdverts` (which reads from the DB) was actively surfacing the hash. Net effect: the **Analyze →** link on older adverts in the node detail page led to a dead "Not found". Two-store inconsistency: DB has the packet, in-memory doesn't, node detail surfaces it from DB → packet detail can't serve it. ## Fix In `handlePacketDetail`: - After in-memory miss, fall back to `db.GetPacketByHash` (already existed) for hash lookups, and `db.GetTransmissionByID` for numeric IDs. - Track when the result came from the DB; if so and the store has no observations, populate from DB via a new `db.GetObservationsForHash` so the response shows real observations instead of the misleading `observation_count = 1` fallback. ## Tests - `TestPacketDetailFallsBackToDBWhenStoreMisses` — insert a packet directly into the DB after `store.Load()`, confirm store doesn't have it, assert 200 + populated observations. - `TestPacketDetail404WhenAbsentFromBoth` — neither store nor DB → 404 (no false positives). - `TestPacketDetailPrefersStoreOverDB` — both have it; store result wins (no double-fetch). - `TestHandlePacketDetailNoStore` updated: it previously asserted the old buggy 404 behavior; now asserts the correct DB-fallback 200. All `go test ./... -run "PacketDetail|Packet|GetPacket"` and the full `cmd/server` suite pass. ## Out of scope The `/api/packets?hash=` filter is the live in-memory list endpoint and intentionally store-only for performance. Not touched here — happy to file a follow-up if you'd rather harmonise. ## Repro context Verified against prod with a recently-adverting repeater whose recent advert hash lives in `recentAdverts` (DB) but had been evicted from the in-memory store; pre-fix 404, post-fix 200 with full observations. Co-authored-by: you <you@example.com>