Add new alert architecture
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Urtzi Alfaro
197
migrations/001_create_alert_tables.sql
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197
migrations/001_create_alert_tables.sql
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-- migrations/001_create_alert_tables.sql
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-- Database schema for unified alerts and recommendations system
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-- Main alerts table (stores both alerts and recommendations)
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CREATE TABLE IF NOT EXISTS alerts (
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id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
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tenant_id UUID NOT NULL,
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item_type VARCHAR(20) NOT NULL DEFAULT 'alert' CHECK (item_type IN ('alert', 'recommendation')),
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alert_type VARCHAR(50) NOT NULL, -- Specific type like 'critical_stock_shortage', 'inventory_optimization'
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severity VARCHAR(20) NOT NULL CHECK (severity IN ('urgent', 'high', 'medium', 'low')),
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status VARCHAR(20) NOT NULL DEFAULT 'active' CHECK (status IN ('active', 'acknowledged', 'resolved')),
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service VARCHAR(50) NOT NULL,
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title VARCHAR(255) NOT NULL,
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message TEXT NOT NULL,
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actions JSONB DEFAULT '[]',
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metadata JSONB DEFAULT '{}',
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created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
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acknowledged_at TIMESTAMP WITH TIME ZONE,
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acknowledged_by UUID,
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resolved_at TIMESTAMP WITH TIME ZONE,
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resolved_by UUID,
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-- Add severity weight for sorting
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severity_weight INT GENERATED ALWAYS AS (
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CASE severity
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WHEN 'urgent' THEN 4
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WHEN 'high' THEN 3
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WHEN 'medium' THEN 2
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WHEN 'low' THEN 1
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END
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) STORED
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);
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-- Indexes for performance
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CREATE INDEX IF NOT EXISTS idx_alerts_tenant_status ON alerts(tenant_id, status);
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CREATE INDEX IF NOT EXISTS idx_alerts_created_at ON alerts(created_at DESC);
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CREATE INDEX IF NOT EXISTS idx_alerts_severity ON alerts(severity_weight DESC);
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CREATE INDEX IF NOT EXISTS idx_alerts_tenant_active ON alerts(tenant_id, status) WHERE status = 'active';
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CREATE INDEX IF NOT EXISTS idx_alerts_item_type ON alerts(item_type);
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CREATE INDEX IF NOT EXISTS idx_alerts_service ON alerts(service);
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-- Composite index for common queries
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CREATE INDEX IF NOT EXISTS idx_alerts_tenant_type_status ON alerts(tenant_id, item_type, status);
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-- Alert history for audit trail (applies to both alerts and recommendations)
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CREATE TABLE IF NOT EXISTS alert_history (
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id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
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alert_id UUID REFERENCES alerts(id) ON DELETE CASCADE,
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tenant_id UUID NOT NULL,
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action VARCHAR(50) NOT NULL,
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performed_by UUID,
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performed_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
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details JSONB DEFAULT '{}'
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);
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CREATE INDEX IF NOT EXISTS idx_alert_history_alert ON alert_history(alert_id);
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CREATE INDEX IF NOT EXISTS idx_alert_history_tenant ON alert_history(tenant_id);
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-- Database triggers for immediate alerts (recommendations typically not triggered this way)
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-- Stock critical trigger
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CREATE OR REPLACE FUNCTION notify_stock_critical()
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RETURNS TRIGGER AS $$
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BEGIN
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-- Only trigger for alerts, not recommendations
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IF NEW.current_stock < NEW.minimum_stock AND
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OLD.current_stock >= OLD.minimum_stock THEN
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PERFORM pg_notify(
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'stock_alerts',
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json_build_object(
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'tenant_id', NEW.tenant_id,
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'ingredient_id', NEW.id,
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'name', NEW.name,
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'current_stock', NEW.current_stock,
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'minimum_stock', NEW.minimum_stock,
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'alert_type', 'critical_stock_shortage'
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)::text
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);
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END IF;
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql;
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-- Temperature breach trigger
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CREATE OR REPLACE FUNCTION notify_temperature_breach()
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RETURNS TRIGGER AS $$
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BEGIN
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IF NEW.temperature > NEW.max_threshold AND
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NEW.breach_duration_minutes > 30 THEN
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PERFORM pg_notify(
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'temperature_alerts',
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json_build_object(
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'tenant_id', NEW.tenant_id,
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'sensor_id', NEW.sensor_id,
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'location', NEW.location,
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'temperature', NEW.temperature,
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'duration', NEW.breach_duration_minutes,
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'alert_type', 'temperature_breach'
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)::text
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);
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END IF;
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql;
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-- Production delay trigger
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CREATE OR REPLACE FUNCTION notify_production_delay()
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RETURNS TRIGGER AS $$
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BEGIN
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IF NEW.status = 'delayed' AND OLD.status != 'delayed' THEN
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PERFORM pg_notify(
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'production_alerts',
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json_build_object(
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'tenant_id', NEW.tenant_id,
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'batch_id', NEW.id,
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'product_name', NEW.product_name,
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'planned_completion', NEW.planned_completion_time,
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'delay_minutes', EXTRACT(EPOCH FROM (NOW() - NEW.planned_completion_time))/60,
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'alert_type', 'production_delay'
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)::text
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);
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END IF;
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql;
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-- Create placeholder tables for triggers (these would exist in respective services)
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-- This is just for reference - actual tables should be in service-specific migrations
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-- Inventory items table structure (for reference)
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CREATE TABLE IF NOT EXISTS inventory_items (
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id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
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tenant_id UUID NOT NULL,
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name VARCHAR(255) NOT NULL,
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current_stock DECIMAL(10,2) DEFAULT 0,
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minimum_stock DECIMAL(10,2) DEFAULT 0,
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maximum_stock DECIMAL(10,2),
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unit VARCHAR(50) DEFAULT 'kg',
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updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
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);
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-- Temperature readings table structure (for reference)
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CREATE TABLE IF NOT EXISTS temperature_readings (
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id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
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tenant_id UUID NOT NULL,
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sensor_id VARCHAR(100) NOT NULL,
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location VARCHAR(255) NOT NULL,
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temperature DECIMAL(5,2) NOT NULL,
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max_threshold DECIMAL(5,2) DEFAULT 25.0,
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breach_duration_minutes INT DEFAULT 0,
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recorded_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
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);
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-- Production batches table structure (for reference)
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CREATE TABLE IF NOT EXISTS production_batches (
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id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
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tenant_id UUID NOT NULL,
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product_name VARCHAR(255) NOT NULL,
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status VARCHAR(50) DEFAULT 'planned',
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planned_completion_time TIMESTAMP WITH TIME ZONE,
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actual_completion_time TIMESTAMP WITH TIME ZONE,
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created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
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updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
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);
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-- Apply triggers (only if tables exist)
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DO $$
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BEGIN
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-- Stock critical trigger
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IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'inventory_items') THEN
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DROP TRIGGER IF EXISTS stock_critical_trigger ON inventory_items;
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CREATE TRIGGER stock_critical_trigger
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AFTER UPDATE ON inventory_items
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FOR EACH ROW
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EXECUTE FUNCTION notify_stock_critical();
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END IF;
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-- Temperature breach trigger
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IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'temperature_readings') THEN
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DROP TRIGGER IF EXISTS temperature_breach_trigger ON temperature_readings;
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CREATE TRIGGER temperature_breach_trigger
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AFTER INSERT OR UPDATE ON temperature_readings
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FOR EACH ROW
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EXECUTE FUNCTION notify_temperature_breach();
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END IF;
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-- Production delay trigger
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IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'production_batches') THEN
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DROP TRIGGER IF EXISTS production_delay_trigger ON production_batches;
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CREATE TRIGGER production_delay_trigger
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AFTER UPDATE ON production_batches
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FOR EACH ROW
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EXECUTE FUNCTION notify_production_delay();
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END IF;
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END
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$$;
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