Delete row sig_16167ae9a4cc from signals

id sig_16167ae9a4cc
event_id evt_444e605860e5
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T14:46:38.380957+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ed72ae9f4fbeb87a
throttle_s 0
created_at 2026-04-19T14:46:38.380957+00:00
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