Delete row sig_3f49d77a3c8a from signals

id sig_3f49d77a3c8a
event_id evt_b0d228cf4a9e
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6143078 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-17T20:11:54Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-20T20:11:54.360053+00:00
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