Delete row sig_f4f17733bc67 from signals

id sig_f4f17733bc67
event_id evt_d9ab7c1b3b8a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-21T05:55:57.603112+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:613108f036e1e124
throttle_s 0
created_at 2026-04-21T05:55:57.603112+00:00
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