Delete row sig_79988f1f1956 from signals

id sig_79988f1f1956
event_id evt_fa357f00b927
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-13T05:49:24.682235+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:f7dbdf1f0bc3215e
throttle_s 0
created_at 2026-04-13T05:49:24.682235+00:00
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