Delete row sig_39c9fbebef6b from signals

id sig_39c9fbebef6b
event_id evt_b7305f864f1c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-15T17:13:40.744741+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:060e024b166a7cdb
throttle_s 0
created_at 2026-04-15T17:13:40.744741+00:00
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