Delete row sig_444b9bf2e9a6 from signals

id sig_444b9bf2e9a6
event_id evt_ff786f2a88df
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-14T14:00:35.335178+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:e8de8673ec62788f
throttle_s 0
created_at 2026-04-14T14:00:35.335178+00:00
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