[server]: Add return_punctuality_by_timestamp

server/src/functions/return_punctuality_by_timestamp/lambda_function.py

@@ -0,0 +1,30 @@
+import json
+import os
+import boto3
+from boto3.dynamodb.conditions import Key, Attr
+
+os.environ.setdefault('AWS_DEFAULT_REGION', 'us-east-1')
+dynamodb = boto3.resource('dynamodb')
+
+def lambda_handler(event, context):
+    table = dynamodb.Table("punctuality_by_timestamp")
+
+    try:
+        items = []
+        response = table.scan()
+        items.extend(response.get('Items', []))
+
+        while 'LastEvaluatedKey' in response:
+            response = table.scan(ExclusiveStartKey=response['LastEvaluatedKey'])
+            items.extend(response.get('Items', []))
+
+        return {
+            'statusCode': 200,
+            'body': json.dumps(items)
+        }
+
+    except Exception as e:
+        return {
+            'statusCode': 500,
+            'body': json.dumps({'error': str(e)})
+        }