diff --git a/routes/shared_env.py b/routes/shared_env.py
index daca6dc..08adcd9 100644
--- a/routes/shared_env.py
+++ b/routes/shared_env.py
@@ -71,6 +71,66 @@ CREATE TABLE IF NOT EXISTS timer_function_shared_envs (
 );
 
 CREATE INDEX idx_timer_func_shared_env ON timer_function_shared_envs(timer_function_id);
+
+CREATE INDEX idx_shared_env_versions ON shared_environment_versions(shared_env_id);
+
+-- 2. Add version_number column to main table
+ALTER TABLE shared_environments 
+ADD COLUMN IF NOT EXISTS version_number INT NOT NULL DEFAULT 1;
+
+-- 3. Create trigger function for automatic versioning
+CREATE OR REPLACE FUNCTION fn_shared_env_versioning()
+RETURNS TRIGGER
+LANGUAGE plpgsql
+AS $$
+DECLARE
+    next_version INT;
+BEGIN
+    IF TG_OP = 'INSERT' THEN
+        -- Create initial version record
+        INSERT INTO shared_environment_versions (shared_env_id, environment, version_number)
+        VALUES (NEW.id, NEW.environment, 1);
+        
+        -- Ensure version_number is set explicitly
+        UPDATE shared_environments
+           SET version_number = 1
+         WHERE id = NEW.id;
+        
+        RETURN NEW;
+        
+    ELSIF TG_OP = 'UPDATE' THEN
+        -- Only create new version if environment JSON changed
+        IF NEW.environment IS DISTINCT FROM OLD.environment THEN
+            -- Get next version number
+            SELECT COALESCE(MAX(version_number), 0) + 1
+              INTO next_version
+              FROM shared_environment_versions
+             WHERE shared_env_id = NEW.id;
+            
+            -- Insert new version record
+            INSERT INTO shared_environment_versions (shared_env_id, environment, version_number)
+            VALUES (NEW.id, NEW.environment, next_version);
+            
+            -- Update main table version number
+            UPDATE shared_environments
+               SET version_number = next_version
+             WHERE id = NEW.id;
+        END IF;
+        
+        RETURN NEW;
+    END IF;
+    
+    RETURN NEW;
+END;
+$$;
+
+-- 4. Create trigger to fire on INSERT or UPDATE
+CREATE TRIGGER tr_shared_env_versioning
+AFTER INSERT OR UPDATE
+ON shared_environments
+FOR EACH ROW
+EXECUTE PROCEDURE fn_shared_env_versioning();
+
 '''
 
 shared_env = Blueprint('shared_env', __name__)