Delete row sig_831fda23e81e from signals

id sig_831fda23e81e
event_id evt_e60786b763c7
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-17T10:28:58.125690+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:5b6b198656fe08e0
throttle_s 0
created_at 2026-04-17T10:28:58.125690+00:00
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