Delete row sig_1cae12ad3502 from signals

id sig_1cae12ad3502
event_id evt_72e7a2a9f7fe
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-20T19:26:20.313213+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:195ab41ec7882fe7
throttle_s 0
created_at 2026-04-20T19:26:20.313213+00:00
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