Delete row sig_ac390a40bdd4 from signals

id sig_ac390a40bdd4
event_id evt_02a20d94a509
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-18T13:34:51.545191+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:69593209bb14346b
throttle_s 0
created_at 2026-04-18T13:34:51.545191+00:00
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