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src/Database.php

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+<?php
+
+class Database
+{
+    private static ?PDO $pdo = null;
+
+    public static function connect(): PDO
+    {
+        if (self::$pdo === null) {
+            $dir = dirname(DB_PATH);
+            if (!is_dir($dir)) {
+                mkdir($dir, 0755, true);
+            }
+
+            self::$pdo = new PDO('sqlite:' . DB_PATH, null, null, [
+                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+            ]);
+
+            self::$pdo->exec('PRAGMA journal_mode = WAL');
+            self::$pdo->exec('PRAGMA foreign_keys = ON');
+
+            self::migrate();
+        }
+
+        return self::$pdo;
+    }
+
+    private static function migrate(): void
+    {
+        self::$pdo->exec('
+            CREATE TABLE IF NOT EXISTS settings (
+                key TEXT PRIMARY KEY,
+                value TEXT NOT NULL
+            )
+        ');
+
+        self::$pdo->exec('
+            CREATE TABLE IF NOT EXISTS buckets (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                name TEXT NOT NULL,
+                position INTEGER NOT NULL DEFAULT 0,
+                created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
+            )
+        ');
+
+        self::$pdo->exec('
+            CREATE TABLE IF NOT EXISTS cards (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                title TEXT NOT NULL,
+                body TEXT NOT NULL DEFAULT "",
+                color TEXT NOT NULL DEFAULT "#ffffff",
+                bucket_id INTEGER DEFAULT NULL,
+                position INTEGER NOT NULL DEFAULT 0,
+                created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+                updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+                FOREIGN KEY (bucket_id) REFERENCES buckets(id) ON DELETE SET NULL
+            )
+        ');
+
+        // Migrations for existing installs
+        $cols = self::$pdo->query('PRAGMA table_info(cards)')->fetchAll();
+        $colNames = array_column($cols, 'name');
+
+        if (!in_array('bucket_id', $colNames)) {
+            self::$pdo->exec('ALTER TABLE cards ADD COLUMN bucket_id INTEGER DEFAULT NULL REFERENCES buckets(id) ON DELETE SET NULL');
+        }
+        if (!in_array('parent_id', $colNames)) {
+            self::$pdo->exec('ALTER TABLE cards ADD COLUMN parent_id INTEGER DEFAULT NULL REFERENCES cards(id) ON DELETE SET NULL');
+        }
+    }
+}

src/bootstrap.php

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+<?php
+
+require_once __DIR__ . '/../config.php';
+require_once __DIR__ . '/Database.php';
+
+// Ensure data directory is writable
+$dataDir = dirname(DB_PATH);
+if (!is_writable($dataDir) && is_dir($dataDir)) {
+    http_response_code(500);
+    echo 'Data directory is not writable: ' . $dataDir;
+    exit(1);
+}