Delete row sig_f5288951d187 from signals

id sig_f5288951d187
event_id evt_9367e17f3d00
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-18T17:12:22.049363+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:08d25e04dc32958e
throttle_s 0
created_at 2026-04-18T17:12:22.049363+00:00
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