Delete row sig_18ec2153a09a from signals

id sig_18ec2153a09a
event_id evt_e6f95c07d039
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5238223 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T20:54:09Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-17T20:54:09.338552+00:00
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