Delete row sig_4b9d799a577a from signals

id sig_4b9d799a577a
event_id evt_859298d92e09
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-17T23:29:53.313979+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:a7de30155e967863
throttle_s 0
created_at 2026-04-17T23:29:53.313979+00:00
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