restructure project

migrations/003_training_tasks.sql

@@ -0,0 +1,18 @@
+-- Training tasks table for async training job management.
+-- Inference service writes pending tasks; training service polls and executes.
+
+CREATE TABLE IF NOT EXISTS training_tasks (
+    task_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    status VARCHAR(20) NOT NULL DEFAULT 'pending',
+    config JSONB,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
+    scheduled_at TIMESTAMP WITH TIME ZONE,
+    started_at TIMESTAMP WITH TIME ZONE,
+    completed_at TIMESTAMP WITH TIME ZONE,
+    error_message TEXT,
+    model_path TEXT,
+    metrics JSONB
+);
+
+CREATE INDEX IF NOT EXISTS idx_training_tasks_status ON training_tasks(status);
+CREATE INDEX IF NOT EXISTS idx_training_tasks_created ON training_tasks(created_at);