Delete row sig_aa9cc65cf1dc from signals

id sig_aa9cc65cf1dc
event_id evt_05915cd5c736
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T06:22:50.351602+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:03f9353eeb0a0fda
throttle_s 0
created_at 2026-04-20T06:22:50.351602+00:00
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