Delete row sig_2605a6c10897 from signals

id sig_2605a6c10897
event_id evt_d5aa85fc5b6e
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5910948 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T20:25:13Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-10T20:25:13.947928+00:00
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