Delete row sig_8104c55a666e from signals

id sig_8104c55a666e
event_id evt_ede2172af373
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-22T01:04:33.951337+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:5da62809bc486708
throttle_s 0
created_at 2026-04-22T01:04:33.951337+00:00
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