Delete row sig_1332da087793 from signals

id sig_1332da087793
event_id evt_3c46e528d017
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-19T01:31:54.668499+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:fcb315a2d02968d8
throttle_s 0
created_at 2026-04-19T01:31:54.668499+00:00
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