Delete row sig_a6cca1618263 from signals

id sig_a6cca1618263
event_id evt_d487f29a2f44
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T01:11:44.481909+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b241bc88e844e3bb
throttle_s 0
created_at 2026-04-12T01:11:44.481909+00:00
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