Delete row sig_33770dc746af from signals

id sig_33770dc746af
event_id evt_b869709d71c4
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-09T17:20:42.722144+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:6404947e59772e87
throttle_s 0
created_at 2026-04-09T17:20:42.722144+00:00
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