Delete row sig_bc79505480a4 from signals

id sig_bc79505480a4
event_id evt_beca6988c3ef
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-15T00:42:36.075900+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:b19f5f7a55f6421d
throttle_s 0
created_at 2026-04-15T00:42:36.075900+00:00
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