Delete row sig_68975d50ce85 from signals

id sig_68975d50ce85
event_id evt_c877d9935ca7
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-20T14:04:26.874269+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:558c85ce7d81384b
throttle_s 0
created_at 2026-04-20T14:04:26.874269+00:00
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