Delete row sig_6868996dc6ca from signals

id sig_6868996dc6ca
event_id evt_57cdff100d4d
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-09T23:37:49.292952+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:86bf23f5c9e60573
throttle_s 0
created_at 2026-04-09T23:37:49.292952+00:00
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