Delete row sig_fefe4a0e8cd5 from signals

id sig_fefe4a0e8cd5
event_id evt_b738c2bacd01
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-17T12:23:11.711083+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b64ffb731e86b074
throttle_s 0
created_at 2026-04-17T12:23:11.711083+00:00
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