Delete row sig_ab2b8f88bbb2 from signals

id sig_ab2b8f88bbb2
event_id evt_e39e60be93e0
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T01:33:55.956874+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:43c2f5faa9f068e4
throttle_s 0
created_at 2026-04-12T01:33:55.956874+00:00
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