Delete row sig_77a93736f159 from signals

id sig_77a93736f159
event_id evt_f5d052aa2d48
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5923687 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T20:25:13Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-10T20:25:13.947928+00:00
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