Delete row sig_982fd200757f from signals

id sig_982fd200757f
event_id evt_1e80d6e758dd
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-07T14:03:08.192411+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1141d98a499f17fd
throttle_s 0
created_at 2026-04-07T14:03:08.192411+00:00
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