Delete row sig_c91e471e8e32 from signals

id sig_c91e471e8e32
event_id evt_406d0b8e6c93
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-13T17:16:47.972000+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:4b7399dac54c7212
throttle_s 0
created_at 2026-04-13T17:16:47.972000+00:00
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