Delete row sig_f9ef2368ab72 from signals

id sig_f9ef2368ab72
event_id evt_c609cfa59528
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-21T19:02:09.011214+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e7d9b760460bf074
throttle_s 0
created_at 2026-04-21T19:02:09.011214+00:00
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