Delete row sig_f1f370b900e5 from signals

id sig_f1f370b900e5
event_id evt_d6dc3e764085
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T20:56:05.328245+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:9913fa25170d4b3b
throttle_s 0
created_at 2026-04-08T20:56:05.328245+00:00
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