Delete row sig_aa9aa3945669 from signals

id sig_aa9aa3945669
event_id evt_cca1dfb1bc5e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T19:20:18.046397+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b608e03791573217
throttle_s 0
created_at 2026-04-08T19:20:18.046397+00:00
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