diff --git a/water-api/scripts/run-migration.sh b/water-api/scripts/run-migration.sh
new file mode 100755
index 0000000..a265330
--- /dev/null
+++ b/water-api/scripts/run-migration.sh
@@ -0,0 +1,62 @@
+#!/bin/bash
+
+# ============================================================================
+# Database Migration Script
+# Run a specific SQL migration file against the database
+# ============================================================================
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+# Load environment variables
+if [ -f ../.env ]; then
+    export $(cat ../.env | grep -v '^#' | xargs)
+else
+    echo -e "${RED}Error: .env file not found${NC}"
+    exit 1
+fi
+
+# Check if migration file is provided
+if [ -z "$1" ]; then
+    echo -e "${YELLOW}Usage: ./run-migration.sh <migration-file.sql>${NC}"
+    echo ""
+    echo "Available migrations:"
+    ls -1 ../sql/*.sql | grep -v schema.sql
+    exit 1
+fi
+
+MIGRATION_FILE=$1
+
+# Check if file exists
+if [ ! -f "../sql/$MIGRATION_FILE" ]; then
+    echo -e "${RED}Error: Migration file not found: ../sql/$MIGRATION_FILE${NC}"
+    exit 1
+fi
+
+# Construct database URL
+DB_URL="postgresql://${DB_USER}:${DB_PASSWORD}@${DB_HOST}:${DB_PORT}/${DB_NAME}"
+
+echo -e "${YELLOW}========================================${NC}"
+echo -e "${YELLOW}Running migration: $MIGRATION_FILE${NC}"
+echo -e "${YELLOW}Database: $DB_NAME${NC}"
+echo -e "${YELLOW}========================================${NC}"
+echo ""
+
+# Run the migration
+psql "$DB_URL" -f "../sql/$MIGRATION_FILE"
+
+if [ $? -eq 0 ]; then
+    echo ""
+    echo -e "${GREEN}========================================${NC}"
+    echo -e "${GREEN}✓ Migration completed successfully!${NC}"
+    echo -e "${GREEN}========================================${NC}"
+else
+    echo ""
+    echo -e "${RED}========================================${NC}"
+    echo -e "${RED}✗ Migration failed!${NC}"
+    echo -e "${RED}========================================${NC}"
+    exit 1
+fi
diff --git a/water-api/sql/add_meter_project_relation.sql b/water-api/sql/add_meter_project_relation.sql
new file mode 100644
index 0000000..ccab833
--- /dev/null
+++ b/water-api/sql/add_meter_project_relation.sql
@@ -0,0 +1,68 @@
+-- ============================================================================
+-- Add project_id column to meters table
+-- This establishes the relationship between meters and projects
+-- ============================================================================
+
+-- Step 1: Add the column as nullable first (to allow existing data)
+ALTER TABLE meters 
+ADD COLUMN IF NOT EXISTS project_id UUID;
+
+-- Step 2: For existing meters without project_id, try to get it from their concentrator
+UPDATE meters m
+SET project_id = c.project_id
+FROM concentrators c
+WHERE m.concentrator_id = c.id
+  AND m.project_id IS NULL
+  AND m.concentrator_id IS NOT NULL;
+
+-- Step 3: Add foreign key constraint
+ALTER TABLE meters
+DROP CONSTRAINT IF EXISTS meters_project_id_fkey;
+
+ALTER TABLE meters 
+ADD CONSTRAINT meters_project_id_fkey 
+FOREIGN KEY (project_id) 
+REFERENCES projects(id) 
+ON DELETE CASCADE;
+
+-- Step 4: Create index for better query performance
+CREATE INDEX IF NOT EXISTS idx_meters_project_id ON meters(project_id);
+
+-- Step 5: Add comment for documentation
+COMMENT ON COLUMN meters.project_id IS 'Project to which this meter belongs';
+
+-- ============================================================================
+-- Verify the changes
+-- ============================================================================
+
+-- Check if the column was added
+SELECT 
+    column_name, 
+    data_type, 
+    is_nullable,
+    column_default
+FROM information_schema.columns 
+WHERE table_name = 'meters' 
+  AND column_name = 'project_id';
+
+-- Check the constraint
+SELECT
+    conname AS constraint_name,
+    contype AS constraint_type,
+    pg_get_constraintdef(oid) AS constraint_definition
+FROM pg_constraint
+WHERE conrelid = 'meters'::regclass
+  AND conname LIKE '%project_id%';
+
+-- Show meters with their project info
+SELECT 
+    m.id,
+    m.name,
+    m.serial_number,
+    m.project_id,
+    p.name AS project_name,
+    c.name AS concentrator_name
+FROM meters m
+LEFT JOIN projects p ON m.project_id = p.id
+LEFT JOIN concentrators c ON m.concentrator_id = c.id
+LIMIT 10;