Delete row sig_efa380766b7c from signals

id sig_efa380766b7c
event_id evt_cd624ac7c580
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-13T04:20:05.697775+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:dd7b7c700138567c
throttle_s 0
created_at 2026-04-13T04:20:05.697775+00:00
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