Delete row sig_fccd88bc274a from signals

id sig_fccd88bc274a
event_id evt_d81ba71eabf8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T02:38:42.994001+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d069fe07df4f732e
throttle_s 0
created_at 2026-04-10T02:38:42.994001+00:00
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