Delete row sig_fede3dc793dc from signals

id sig_fede3dc793dc
event_id evt_4ea1e400875f
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T03:57:00.505214+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0498fef13f3d9c26
throttle_s 0
created_at 2026-04-22T03:57:00.505214+00:00
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