Delete row sig_1cbf8ef728d6 from signals

id sig_1cbf8ef728d6
event_id evt_95f9bc8de1bf
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-21T11:29:24.864354+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:23df622ff4349986
throttle_s 0
created_at 2026-04-21T11:29:24.864354+00:00
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