Delete row sig_34804eabf916 from signals

id sig_34804eabf916
event_id evt_8ea391ea5bae
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5370983 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T20:55:20Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-10T20:55:20.385387+00:00
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