Delete row sig_ec980d2365e9 from signals

id sig_ec980d2365e9
event_id evt_0004d5296112
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-09T00:58:15.156728+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:b95da6b1e304b840
throttle_s 0
created_at 2026-04-09T00:58:15.156728+00:00
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