Delete row sig_b5f1a8bd389c from signals

id sig_b5f1a8bd389c
event_id evt_ba790fcef2c3
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-17T09:00:11.636290+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:05e19bad885be53d
throttle_s 0
created_at 2026-04-17T09:00:11.636290+00:00
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