Delete row sig_e494ad16537c from signals

id sig_e494ad16537c
event_id evt_af6d70ff6826
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-07T08:17:31.106928+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:850b08b56a65914e
throttle_s 0
created_at 2026-04-07T08:17:31.106928+00:00
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