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Serve an event's full stored body over HTTP (closes #157)
The 8 KB render cap from #135 left storage untouched but no route served
the rest, so a body over the cap was reachable only with filesystem
access to the SQLite files — in a product whose purpose is storing
webhooks so they can be inspected.

GET /source/{sourceID}/logs/{eventID}/body serves the whole body to the
webhook's owner, as application/octet-stream with an attachment
disposition and nosniff. Those are a security control, not formatting:
the bytes come from the public receiver and are handed back inside the
operator's authenticated origin, and the existing CSP would not stop a
stored HTML payload executing there. The truncation marker links to it
only when a body was actually cut.

Accepted deviation, documented rather than glossed: #157's definition of
done asks the route to stream from the row. It buffers whole instead,
because database/sql exposes no incremental handle on a SQLite BLOB and
substr range reads re-materialise the entire column per call — an
earlier revision chunked at 64 KiB and was 11-15x slower for a worse
bound. Three independent reviewers confirmed no streaming path exists.

Independently reviewed three times. Two earlier revisions each asserted
a memory bound the code did not have; the final reviewer measured
2.057x at the ingest cap and pinned the two overlapping allocations from
source — the driver's column buffer and database/sql's convertAssign
clone — confirming the stated "roughly two bodies, and 2x is a floor
not a ceiling" is now accurate, since SQLite's own materialisation sits
outside the Go heap.
2026-08-18 00:41:31 +02:00
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