Delete row sig_f2c917ce8263 from signals

id sig_f2c917ce8263
event_id evt_a00d31007379
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T23:11:52.932451+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:6f622c2d4d0f38d4
throttle_s 0
created_at 2026-04-10T23:11:52.932451+00:00
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