Delete row sig_c1435d155095 from signals

id sig_c1435d155095
event_id evt_1d7905207dba
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-09T08:23:56.312936+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:10072689620835e2
throttle_s 0
created_at 2026-04-09T08:23:56.312936+00:00
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