Delete row sig_c89621911a29 from signals

id sig_c89621911a29
event_id evt_16b60c5cb75c
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5712448 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T20:49:04Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-17T20:49:04.121999+00:00
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