Delete row sig_dc7b3fabc2e7 from signals

id sig_dc7b3fabc2e7
event_id evt_52a00f87c62f
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-18T18:03:41.494209+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:550087286c6fe2e6
throttle_s 0
created_at 2026-04-18T18:03:41.494209+00:00
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