Delete row sig_6178c40f44bb from signals

id sig_6178c40f44bb
event_id evt_b2e352f640d8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T07:26:43.316167+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:bb37295718cadec0
throttle_s 0
created_at 2026-04-08T07:26:43.316167+00:00
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