Delete row sig_c15b6e986c5f from signals

id sig_c15b6e986c5f
event_id evt_5822720aaa26
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T15:01:40.094870+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:d7aa0bb94358ec3e
throttle_s 0
created_at 2026-04-11T15:01:40.094870+00:00
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