create prompt table

scripts/create_prompt_table.sql

@@ -0,0 +1,30 @@
+-- A prompt_set groups a full collection of prompts together.
+-- Each pipeline can have many sets (versions, A/B variants, etc.);
+-- exactly one should be marked is_active per pipeline.
+CREATE TABLE IF NOT EXISTS prompt_sets (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    pipeline_id VARCHAR(64) NOT NULL,
+    name VARCHAR(128) NOT NULL,
+    description TEXT DEFAULT '',
+    is_active BOOLEAN DEFAULT false,
+    created_at TIMESTAMPTZ DEFAULT now(),
+    updated_at TIMESTAMPTZ DEFAULT now()
+);
+
+-- Fast lookup of the active set for a pipeline
+CREATE INDEX IF NOT EXISTS idx_prompt_sets_pipeline_active
+    ON prompt_sets(pipeline_id, is_active);
+
+-- Each prompt belongs to a prompt_set, keyed by prompt_key.
+CREATE TABLE IF NOT EXISTS prompt_templates (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    prompt_set_id UUID NOT NULL REFERENCES prompt_sets(id) ON DELETE CASCADE,
+    prompt_key VARCHAR(64) NOT NULL,
+    content TEXT NOT NULL,
+    created_at TIMESTAMPTZ DEFAULT now(),
+    updated_at TIMESTAMPTZ DEFAULT now(),
+    UNIQUE(prompt_set_id, prompt_key)
+);
+
+CREATE INDEX IF NOT EXISTS idx_prompt_templates_set_id
+    ON prompt_templates(prompt_set_id);