Delete row sig_73a07391463a from signals

id sig_73a07391463a
event_id evt_b3fa1cffc0a3
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-18T22:33:08.170684+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:5ea00f7161df8fe9
throttle_s 0
created_at 2026-04-18T22:33:08.170684+00:00
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