Delete row sig_e99ae2b4db35 from signals

id sig_e99ae2b4db35
event_id evt_5b283fed0334
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T01:55:30.966789+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e7d1ce059c9078b3
throttle_s 0
created_at 2026-04-19T01:55:30.966789+00:00
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