Add prompts table and settings page to create/read/update/delete from it, incorporate company specific prompts into ai validation

inventory-server/db/setup-schema.sql

@@ -23,6 +23,26 @@ CREATE TABLE IF NOT EXISTS templates (
     UNIQUE(company, product_type)
 );
 
+-- AI Prompts table for storing validation prompts
+CREATE TABLE IF NOT EXISTS ai_prompts (
+    id SERIAL PRIMARY KEY,
+    prompt_text TEXT NOT NULL,
+    prompt_type TEXT NOT NULL CHECK (prompt_type IN ('general', 'company_specific')),
+    company TEXT,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT unique_company_prompt UNIQUE (company),
+    CONSTRAINT company_required_for_specific CHECK (
+        (prompt_type = 'general' AND company IS NULL) OR 
+        (prompt_type = 'company_specific' AND company IS NOT NULL)
+    )
+);
+
+-- Create a unique partial index to ensure only one general prompt
+CREATE UNIQUE INDEX IF NOT EXISTS idx_unique_general_prompt 
+ON ai_prompts (prompt_type) 
+WHERE prompt_type = 'general';
+
 -- AI Validation Performance Tracking
 CREATE TABLE IF NOT EXISTS ai_validation_performance (
     id SERIAL PRIMARY KEY,
@@ -50,4 +70,10 @@ $$ language 'plpgsql';
 CREATE TRIGGER update_templates_updated_at
     BEFORE UPDATE ON templates
     FOR EACH ROW
+    EXECUTE FUNCTION update_updated_at_column();
+
+-- Trigger to automatically update the updated_at column for ai_prompts
+CREATE TRIGGER update_ai_prompts_updated_at
+    BEFORE UPDATE ON ai_prompts
+    FOR EACH ROW
     EXECUTE FUNCTION update_updated_at_column();