Delete row sig_f659015e57de from signals

id sig_f659015e57de
event_id evt_c5bc15cc41cf
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T03:31:12.838878+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:7aa5177ba4df8bbb
throttle_s 0
created_at 2026-04-20T03:31:12.838878+00:00
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