A counter pushed past int64 (multi-node setups hit this via historic
delta-compounding bugs) makes SQLite silently promote the INTEGER cell
to REAL. From then on the column no longer scans into the Go int64
field and every reader of client_traffics fails at once: the inbounds
page, xray restarts, and node traffic sync all return "converting
driver.Value type float64 to int64".
Two-part fix: every unbounded "up = up + ?" add (local traffic, node
delta merge, inbound counters, plus the Go-side outbound accumulation)
now saturates at TrafficMax, a cap safely below math.MaxInt64 so one
more delta cannot overflow; and a startup repair casts REAL-promoted
cells back to INTEGER and clamps all traffic counters into
[0, TrafficMax] across client_traffics, inbounds, outbound_traffics
and node_client_traffics, restoring access to already-corrupted panels
without manual sqlite surgery.
Closes#5762
MHSanaei