Delete row sig_ecacbb929e3c from signals

id sig_ecacbb929e3c
event_id evt_6d63c2f7cd6a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T09:48:06.495644+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f31b27b8521f85e8
throttle_s 0
created_at 2026-04-20T09:48:06.495644+00:00
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