Delete row sig_a8734885c7a7 from signals

id sig_a8734885c7a7
event_id evt_00784efc6c8b
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5372380 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-18T20:12:54Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-21T20:12:54.152594+00:00
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