add all files

shared-endpoint/src/Database.php

@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Lasuca\SharedEndpoint;
+
+use mysqli;
+use RuntimeException;
+
+/**
+ * Fetch the latest snapshot of all SCADA tags.
+ *
+ * @param array<string,string> $config Connection credentials map.
+ *
+ * @return array<int,array<string,mixed>> Normalised tag rows.
+ */
+function fetchLatestItems(array $config): array
+{
+    $connection = new mysqli(
+        $config['host'],
+        $config['username'],
+        $config['password'],
+        $config['database']
+    );
+
+    if ($connection->connect_error) {
+        $message = 'MySQL connection failed: ' . $connection->connect_error;
+        throw new RuntimeException($message);
+    }
+
+    $query = <<<SQL
+        SELECT
+            ID,
+            Name,
+            ROUND(Value, 0) AS Value,
+            ROUND(Value, 1) AS RoundedValue1,
+            ROUND(Value, 2) AS RoundedValue2,
+            Timestamp
+        FROM items
+        ORDER BY ID ASC
+    SQL;
+
+    $result = $connection->query($query);
+    if ($result === false) {
+        $message = 'Query failed: ' . $connection->error;
+        $connection->close();
+        throw new RuntimeException($message);
+    }
+
+    $rows = [];
+    while ($row = $result->fetch_assoc()) {
+        $rows[] = [
+            'tagId' => (int) $row['ID'],
+            'name' => $row['Name'],
+            'value' => (float) $row['Value'],
+            'rounded1' => (float) $row['RoundedValue1'],
+            'rounded2' => (float) $row['RoundedValue2'],
+            'timestamp' => $row['Timestamp'],
+        ];
+    }
+
+    $result->free();
+    $connection->close();
+
+    return $rows;
+}