Delete row sig_950b0a74e220 from signals

id sig_950b0a74e220
event_id evt_f2eb1493d8eb
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T03:56:31.114798+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:9be9f5153d17f4e3
throttle_s 0
created_at 2026-04-18T03:56:31.114798+00:00
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