Delete row sig_18d8ace4d8f6 from signals

id sig_18d8ace4d8f6
event_id evt_d57e8691cdc1
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-20T18:43:34.101858+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:e1dd47ec0d1cdb92
throttle_s 0
created_at 2026-04-20T18:43:34.101858+00:00
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