Delete row sig_afd6060461dd from signals

id sig_afd6060461dd
event_id evt_2f9e7e46d254
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T03:10:59.035246+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:cec23e98ce35c833
throttle_s 0
created_at 2026-04-20T03:10:59.035246+00:00
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