Delete row sig_1ec4b34d8977 from signals

id sig_1ec4b34d8977
event_id evt_84a2faef55ec
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T00:04:24.932995+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:6c989e437de02110
throttle_s 0
created_at 2026-04-11T00:04:24.932995+00:00
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