Delete row sig_2001c89b51e9 from signals

id sig_2001c89b51e9
event_id evt_defec411d36b
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-17T11:58:26.319509+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:ffde6dfbea5e278c
throttle_s 0
created_at 2026-04-17T11:58:26.319509+00:00
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