Delete row sig_fb950f6ae3ec from signals

id sig_fb950f6ae3ec
event_id evt_bc450686005c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-06T16:14:14.257993+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:4953f4e77782b7a9
throttle_s 0
created_at 2026-04-06T16:14:14.257993+00:00
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