From 1f7f7dc7935fa6ef0fa1aaeb4f4c5db2a4907316 Mon Sep 17 00:00:00 2001
From: Miuroro <monera.mual@gmail.com>
Date: Wed, 1 Apr 2026 18:57:09 +0200
Subject: [PATCH 1/3] added the queries in the queries.sql task-1

---
 task-1/books_library.db | Bin 24576 -> 24576 bytes
 task-1/queries.sql      |  40 ++++++++++++++++++++++++++++++++++++++--
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/task-1/books_library.db b/task-1/books_library.db
index 88b0418c6cf5291e897c14742bfcd1b1868c352a..2175dcbd43b609cfafcfb2861a38a887b1f75da7 100644
GIT binary patch
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diff --git a/task-1/queries.sql b/task-1/queries.sql
index fecf7ad..67ad979 100644
--- a/task-1/queries.sql
+++ b/task-1/queries.sql
@@ -1,21 +1,54 @@
 ---- Queries
 
 -- **Question 1** — List the title and published year of every book in the `'Science Fiction'` genre, ordered by published year (oldest first).
+SELECT title, published_year
+FROM books
+WHERE genre = 'Science Fiction'
+ORDER BY published_year ASC;
 
 -- **Question 2** — Show every book published before 1950. Display the title and year only.
+SELECT title, published_year
+FROM books
+WHERE published_year < 1950;
 
 -- **Question 3** — Show every book in the database along with its author's full name. Combine `first_name` and `last_name` into a single column called `author`. _(Hint: you will need a JOIN.)_
+SELECT b.title,
+       a.first_name || ' ' || a.last_name AS author
+FROM books b
+JOIN authors a ON b.author_id = a.id;
 
 -- **Question 4** — List all books written by Stephen King. Show the title and published year, ordered by year. _(Hint: JOIN the two tables and filter on the author's name.)_
+SELECT b.title, b.published_year
+FROM books b
+JOIN authors a ON b.author_id = a.id
+WHERE a.first_name = 'Stephen' AND a.last_name = 'King'
+ORDER BY b.published_year ASC;
 
 -- **Question 5** — Add yourself as a new author. Use your real name, or make one up. Pick any nationality and birth year.
+INSERT INTO authors (first_name, last_name, nationality, birth_year)
+VALUES ('Monerh', 'Al Sqyan', 'Saudi', 1993);
 
 -- **Question 6** — Add one book for the author you just inserted. It can be a real book or a made-up one.
+INSERT INTO books (title, published_year, genre, author_id)
+VALUES (
+  'The Legends Of Moon',
+  2026,
+  'Fiction',
+  (SELECT id FROM authors WHERE first_name = 'Monerh' AND last_name = 'Al Sqyan')
+);
 
 -- **Question 7** — The genre for "The Dark Tower: The Gunslinger" was entered incorrectly as `'Fantasy'`. It should be `'Horror'`. Write an UPDATE to fix it, then verify the change with a SELECT.
+UPDATE books
+SET genre = 'Horror'
+WHERE title = 'The Dark Tower: The Gunslinger';
+SELECT title, genre
+FROM books
+WHERE title = 'The Dark Tower: The Gunslinger';
 
 -- **Question 8** — Delete the book you added in Question 6. Make sure your query targets only that specific row.
-
+DELETE FROM books
+WHERE title = 'The Legends Of Moon'
+  AND author_id = (SELECT id FROM authors WHERE first_name = 'Monerh' AND last_name = 'Al Sqyan');
 ---
 
 -- ### Bonus questions _(optional)_
@@ -23,5 +56,8 @@
 -- These cover topics slightly beyond the core material. Have a go if you finish early.
 
 -- **Bonus A** — How many books are there per genre? Show the genre name and the count, ordered from most to fewest books.
-
+SELECT genre, COUNT(*) AS book_count
+FROM books
+GROUP BY genre
+ORDER BY book_count DESC;
 -- **Bonus B** — Find any authors in the database who have no books at all. _(Hint: you will need a LEFT JOIN and check for NULL.)

From 9808c9dfa7e77b243607d0467c17caffb16f75b9 Mon Sep 17 00:00:00 2001
From: Miuroro <monera.mual@gmail.com>
Date: Wed, 1 Apr 2026 20:29:46 +0200
Subject: [PATCH 2/3]  finished implementing files for the flashcard app task-2

---
 task-2/data/flashcards.db | Bin 0 -> 16384 bytes
 task-2/migrate.js         |  43 ++++
 task-2/package-lock.json  | 467 ++++++++++++++++++++++++++++++++++++++
 task-2/setup.sql          |  19 ++
 task-2/src/database.js    |  75 +++++-
 5 files changed, 592 insertions(+), 12 deletions(-)
 create mode 100644 task-2/data/flashcards.db
 create mode 100644 task-2/migrate.js
 create mode 100644 task-2/package-lock.json
 create mode 100644 task-2/setup.sql

diff --git a/task-2/data/flashcards.db b/task-2/data/flashcards.db
new file mode 100644
index 0000000000000000000000000000000000000000..bdefbd9fbdd45ae7ed683dcef80862fd7af4b179
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literal 0
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diff --git a/task-2/migrate.js b/task-2/migrate.js
new file mode 100644
index 0000000..cb156e9
--- /dev/null
+++ b/task-2/migrate.js
@@ -0,0 +1,43 @@
+import Database from "better-sqlite3";
+import { readFileSync } from "fs";
+import { fileURLToPath } from "url";
+import { dirname, join } from "path";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const DATA_FILE = join(__dirname, "data/data.json");
+const DB_FILE = join(__dirname, "data/flashcards.db");
+
+let db;
+
+try {
+  const data = JSON.parse(readFileSync(DATA_FILE, "utf-8"));
+  db = new Database(DB_FILE);
+
+  const insertDeck = db.prepare(
+    "INSERT INTO decks (id, name, description) VALUES (?, ?, ?)",
+  );
+  for (const deck of data.decks) {
+    insertDeck.run(deck.id, deck.name, deck.description);
+  }
+  console.log(`Inserted ${data.decks.length} decks`);
+
+  const insertCard = db.prepare(
+    "INSERT INTO cards (id, question, answer, learned, deck_id) VALUES (?, ?, ?, ?, ?)",
+  );
+  for (const card of data.cards) {
+    insertCard.run(
+      card.id,
+      card.question,
+      card.answer,
+      card.learned ? 1 : 0,
+      card.deckId,
+    );
+  }
+  console.log(`Inserted ${data.cards.length} cards`);
+  console.log("Migration complete");
+} catch (err) {
+  console.error("Error:", err.message);
+  process.exit(1);
+} finally {
+  db?.close();
+}
diff --git a/task-2/package-lock.json b/task-2/package-lock.json
new file mode 100644
index 0000000..72fc35b
--- /dev/null
+++ b/task-2/package-lock.json
@@ -0,0 +1,467 @@
+{
+  "name": "flashcard-app",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "flashcard-app",
+      "version": "1.0.0",
+      "dependencies": {
+        "better-sqlite3": "^12.8.0"
+      }
+    },
+    "node_modules/base64-js": {
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+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
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+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/better-sqlite3": {
+      "version": "12.8.0",
+      "resolved": "https://registry.npmjs.org/better-sqlite3/-/better-sqlite3-12.8.0.tgz",
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+      "hasInstallScript": true,
+      "license": "MIT",
+      "dependencies": {
+        "bindings": "^1.5.0",
+        "prebuild-install": "^7.1.1"
+      },
+      "engines": {
+        "node": "20.x || 22.x || 23.x || 24.x || 25.x"
+      }
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+      "license": "MIT",
+      "dependencies": {
+        "file-uri-to-path": "1.0.0"
+      }
+    },
+    "node_modules/bl": {
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+      "license": "MIT",
+      "dependencies": {
+        "buffer": "^5.5.0",
+        "inherits": "^2.0.4",
+        "readable-stream": "^3.4.0"
+      }
+    },
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+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
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+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "base64-js": "^1.3.1",
+        "ieee754": "^1.1.13"
+      }
+    },
+    "node_modules/chownr": {
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+      "license": "ISC"
+    },
+    "node_modules/decompress-response": {
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+      },
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+      "funding": {
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+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/end-of-stream": {
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+      "dependencies": {
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+      }
+    },
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+      "license": "(MIT OR WTFPL)",
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/file-uri-to-path": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz",
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+    },
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+      "license": "MIT"
+    },
+    "node_modules/github-from-package": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/github-from-package/-/github-from-package-0.0.0.tgz",
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+    },
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+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
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+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
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+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
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+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
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+      "version": "0.5.3",
+      "resolved": "https://registry.npmjs.org/mkdirp-classic/-/mkdirp-classic-0.5.3.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/napi-build-utils": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/napi-build-utils/-/napi-build-utils-2.0.0.tgz",
+      "integrity": "sha512-GEbrYkbfF7MoNaoh2iGG84Mnf/WZfB0GdGEsM8wz7Expx/LlWf5U8t9nvJKXSp3qr5IsEbK04cBGhol/KwOsWA==",
+      "license": "MIT"
+    },
+    "node_modules/node-abi": {
+      "version": "3.89.0",
+      "resolved": "https://registry.npmjs.org/node-abi/-/node-abi-3.89.0.tgz",
+      "integrity": "sha512-6u9UwL0HlAl21+agMN3YAMXcKByMqwGx+pq+P76vii5f7hTPtKDp08/H9py6DY+cfDw7kQNTGEj/rly3IgbNQA==",
+      "license": "MIT",
+      "dependencies": {
+        "semver": "^7.3.5"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/once": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+      "integrity": "sha512-lNaJgI+2Q5URQBkccEKHTQOPaXdUxnZZElQTZY0MFUAuaEqe1E+Nyvgdz/aIyNi6Z9MzO5dv1H8n58/GELp3+w==",
+      "license": "ISC",
+      "dependencies": {
+        "wrappy": "1"
+      }
+    },
+    "node_modules/prebuild-install": {
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/prebuild-install/-/prebuild-install-7.1.3.tgz",
+      "integrity": "sha512-8Mf2cbV7x1cXPUILADGI3wuhfqWvtiLA1iclTDbFRZkgRQS0NqsPZphna9V+HyTEadheuPmjaJMsbzKQFOzLug==",
+      "deprecated": "No longer maintained. Please contact the author of the relevant native addon; alternatives are available.",
+      "license": "MIT",
+      "dependencies": {
+        "detect-libc": "^2.0.0",
+        "expand-template": "^2.0.3",
+        "github-from-package": "0.0.0",
+        "minimist": "^1.2.3",
+        "mkdirp-classic": "^0.5.3",
+        "napi-build-utils": "^2.0.0",
+        "node-abi": "^3.3.0",
+        "pump": "^3.0.0",
+        "rc": "^1.2.7",
+        "simple-get": "^4.0.0",
+        "tar-fs": "^2.0.0",
+        "tunnel-agent": "^0.6.0"
+      },
+      "bin": {
+        "prebuild-install": "bin.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/pump": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.4.tgz",
+      "integrity": "sha512-VS7sjc6KR7e1ukRFhQSY5LM2uBWAUPiOPa/A3mkKmiMwSmRFUITt0xuj+/lesgnCv+dPIEYlkzrcyXgquIHMcA==",
+      "license": "MIT",
+      "dependencies": {
+        "end-of-stream": "^1.1.0",
+        "once": "^1.3.1"
+      }
+    },
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+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/rc/-/rc-1.2.8.tgz",
+      "integrity": "sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==",
+      "license": "(BSD-2-Clause OR MIT OR Apache-2.0)",
+      "dependencies": {
+        "deep-extend": "^0.6.0",
+        "ini": "~1.3.0",
+        "minimist": "^1.2.0",
+        "strip-json-comments": "~2.0.1"
+      },
+      "bin": {
+        "rc": "cli.js"
+      }
+    },
+    "node_modules/readable-stream": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/safe-buffer": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/semver": {
+      "version": "7.7.4",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.4.tgz",
+      "integrity": "sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA==",
+      "license": "ISC",
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/simple-concat": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.1.tgz",
+      "integrity": "sha512-cSFtAPtRhljv69IK0hTVZQ+OfE9nePi/rtJmw5UjHeVyVroEqJXP1sFztKUy1qU+xvz3u/sfYJLa947b7nAN2Q==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/simple-get": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/simple-get/-/simple-get-4.0.1.tgz",
+      "integrity": "sha512-brv7p5WgH0jmQJr1ZDDfKDOSeWWg+OVypG99A/5vYGPqJ6pxiaHLy8nxtFjBA7oMa01ebA9gfh1uMCFqOuXxvA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "decompress-response": "^6.0.0",
+        "once": "^1.3.1",
+        "simple-concat": "^1.0.0"
+      }
+    },
+    "node_modules/string_decoder": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "~5.2.0"
+      }
+    },
+    "node_modules/strip-json-comments": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+      "integrity": "sha512-4gB8na07fecVVkOI6Rs4e7T6NOTki5EmL7TUduTs6bu3EdnSycntVJ4re8kgZA+wx9IueI2Y11bfbgwtzuE0KQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/tar-fs": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-2.1.4.tgz",
+      "integrity": "sha512-mDAjwmZdh7LTT6pNleZ05Yt65HC3E+NiQzl672vQG38jIrehtJk/J3mNwIg+vShQPcLF/LV7CMnDW6vjj6sfYQ==",
+      "license": "MIT",
+      "dependencies": {
+        "chownr": "^1.1.1",
+        "mkdirp-classic": "^0.5.2",
+        "pump": "^3.0.0",
+        "tar-stream": "^2.1.4"
+      }
+    },
+    "node_modules/tar-stream": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-2.2.0.tgz",
+      "integrity": "sha512-ujeqbceABgwMZxEJnk2HDY2DlnUZ+9oEcb1KzTVfYHio0UE6dG71n60d8D2I4qNvleWrrXpmjpt7vZeF1LnMZQ==",
+      "license": "MIT",
+      "dependencies": {
+        "bl": "^4.0.3",
+        "end-of-stream": "^1.4.1",
+        "fs-constants": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^3.1.1"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha512-McnNiV1l8RYeY8tBgEpuodCC1mLUdbSN+CYBL7kJsJNInOP8UjDDEwdk6Mw60vdLLrr5NHKZhMAOSrR2NZuQ+w==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "safe-buffer": "^5.0.1"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "license": "MIT"
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "license": "ISC"
+    }
+  }
+}
diff --git a/task-2/setup.sql b/task-2/setup.sql
new file mode 100644
index 0000000..6b6fc17
--- /dev/null
+++ b/task-2/setup.sql
@@ -0,0 +1,19 @@
+PRAGMA foreign_keys = ON;
+
+DROP TABLE IF EXISTS cards;
+DROP TABLE IF EXISTS decks;
+
+CREATE TABLE decks (
+	id INTEGER PRIMARY KEY AUTOINCREMENT,
+	name TEXT NOT NULL,
+	description TEXT
+);
+
+CREATE TABLE cards (
+	id INTEGER PRIMARY KEY AUTOINCREMENT,
+	question TEXT NOT NULL,
+	answer TEXT NOT NULL,
+	learned INTEGER NOT NULL DEFAULT 0,
+	deck_id INTEGER NOT NULL,
+	FOREIGN KEY (deck_id) REFERENCES decks(id)
+);
diff --git a/task-2/src/database.js b/task-2/src/database.js
index a737fcb..f75ca07 100644
--- a/task-2/src/database.js
+++ b/task-2/src/database.js
@@ -6,12 +6,12 @@
 // When every function works correctly, `node app.js` should
 // print exactly the same output as it did with storage.js.
 
-import Database from 'better-sqlite3';
-import { fileURLToPath } from 'url';
-import { dirname, join } from 'path';
+import Database from "better-sqlite3";
+import { fileURLToPath } from "url";
+import { dirname, join } from "path";
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
-const DB_FILE = join(__dirname, '../data/flashcards.db');
+const DB_FILE = join(__dirname, "../data/flashcards.db");
 
 const db = new Database(DB_FILE);
 
@@ -21,23 +21,43 @@ const db = new Database(DB_FILE);
 
 export function getAllDecks() {
   // TODO: return all rows from the decks table
-  throw new Error('Not implemented');
+  try {
+    return db.prepare("SELECT * FROM decks").all();
+  } catch (err) {
+    throw new Error("Not implemented");
+  }
 }
 
 export function getDeckById(id) {
   // TODO: return the deck row with the given id, or null if not found
-  throw new Error('Not implemented');
+  try {
+    return db.prepare("SELECT * FROM decks WHERE id = ?").get(id) ?? null;
+  } catch (err) {
+    throw new Error("Not implemented");
+  }
 }
 
 export function addDeck(name, description) {
   // TODO: insert a new deck and return the new row (including its id)
-  throw new Error('Not implemented');
+  try {
+    const info = db
+      .prepare("INSERT INTO decks (name, description) VALUES (?, ?)")
+      .run(name, description);
+    return { id: info.lastInsertRowid, name, description };
+  } catch (err) {
+    throw new Error("Not implemented");
+  }
 }
 
 export function deleteDeck(deckId) {
   // TODO: delete the deck with the given id
   //       return true if a row was deleted, false otherwise
-  throw new Error('Not implemented');
+  try {
+    const info = db.prepare("DELETE FROM decks WHERE id = ?").run(deckId);
+    return info.changes > 0;
+  } catch (err) {
+    throw new Error("Not implemented");
+  }
 }
 
 // ----------------------------------------------------------------
@@ -46,22 +66,53 @@ export function deleteDeck(deckId) {
 
 export function getAllCardsForDeck(deckId) {
   // TODO: return all card rows whose deckId matches
-  throw new Error('Not implemented');
+  try {
+    return db
+      .prepare(
+        "SELECT id, question, answer, learned, deck_id AS deckId FROM cards WHERE deck_id = ?",
+      )
+      .all(deckId);
+  } catch (err) {
+    throw new Error("Not implemented");
+  }
 }
 
 export function addCard(question, answer, deckId) {
   // TODO: insert a new card and return the new row (including its id)
-  throw new Error('Not implemented');
+  try {
+    const info = db
+      .prepare("INSERT INTO cards (question, answer, deck_id) VALUES (?, ?, ?)")
+      .run(question, answer, deckId);
+    return { id: info.lastInsertRowid, question, answer, learned: 0, deckId };
+  } catch (err) {
+    throw new Error("Not implemented");
+  }
 }
 
 export function markCardLearned(cardId) {
   // TODO: set learned = 1 for the card with the given id
   //       return the updated row, or null if not found
-  throw new Error('Not implemented');
+  try {
+    db.prepare("UPDATE cards SET learned = 1 WHERE id = ?").run(cardId);
+    return (
+      db
+        .prepare(
+          "SELECT id, question, answer, learned, deck_id AS deckId FROM cards WHERE id = ?",
+        )
+        .get(cardId) ?? null
+    );
+  } catch (err) {
+    throw new Error("Not implemented");
+  }
 }
 
 export function deleteCard(cardId) {
   // TODO: delete the card with the given id
   //       return true if a row was deleted, false otherwise
-  throw new Error('Not implemented');
+  try {
+    const info = db.prepare("DELETE FROM cards WHERE id = ?").run(cardId);
+    return info.changes > 0;
+  } catch (err) {
+    throw new Error("Not implemented");
+  }
 }

From a7a27bca007579794ebead0c838c1fa90fd348b6 Mon Sep 17 00:00:00 2001
From: Miuroro <monera.mual@gmail.com>
Date: Wed, 8 Apr 2026 14:52:11 +0200
Subject: [PATCH 3/3] Implement SQLite storage layer in database.js

---
 task-2/src/database.js | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/task-2/src/database.js b/task-2/src/database.js
index f75ca07..48c0558 100644
--- a/task-2/src/database.js
+++ b/task-2/src/database.js
@@ -24,7 +24,7 @@ export function getAllDecks() {
   try {
     return db.prepare("SELECT * FROM decks").all();
   } catch (err) {
-    throw new Error("Not implemented");
+    throw new Error(`Failed to fetch all decks: ${err.message}`);
   }
 }
 
@@ -33,7 +33,7 @@ export function getDeckById(id) {
   try {
     return db.prepare("SELECT * FROM decks WHERE id = ?").get(id) ?? null;
   } catch (err) {
-    throw new Error("Not implemented");
+    throw new Error(`Failed to fetch deck: ${id}${err.message}`);
   }
 }
 
@@ -45,7 +45,7 @@ export function addDeck(name, description) {
       .run(name, description);
     return { id: info.lastInsertRowid, name, description };
   } catch (err) {
-    throw new Error("Not implemented");
+    throw new Error(`Failed to create deck: ${err.message}`);
   }
 }
 
@@ -56,7 +56,7 @@ export function deleteDeck(deckId) {
     const info = db.prepare("DELETE FROM decks WHERE id = ?").run(deckId);
     return info.changes > 0;
   } catch (err) {
-    throw new Error("Not implemented");
+    throw new Error(`Failed to delete deck: ${id}${err.message}`);
   }
 }
 
@@ -73,7 +73,7 @@ export function getAllCardsForDeck(deckId) {
       )
       .all(deckId);
   } catch (err) {
-    throw new Error("Not implemented");
+    throw new Error(`Failed to fetch cards for deck: ${err.message}`);
   }
 }
 
@@ -85,7 +85,7 @@ export function addCard(question, answer, deckId) {
       .run(question, answer, deckId);
     return { id: info.lastInsertRowid, question, answer, learned: 0, deckId };
   } catch (err) {
-    throw new Error("Not implemented");
+    throw new Error(`Failed to add card: ${err.message}`);
   }
 }
 
@@ -94,15 +94,17 @@ export function markCardLearned(cardId) {
   //       return the updated row, or null if not found
   try {
     db.prepare("UPDATE cards SET learned = 1 WHERE id = ?").run(cardId);
-    return (
+    const card =
       db
         .prepare(
           "SELECT id, question, answer, learned, deck_id AS deckId FROM cards WHERE id = ?",
         )
-        .get(cardId) ?? null
-    );
+        .get(cardId) ?? null;
+
+    if (!card) return null;
+    return { ...card, learned: card.learned === 1 };
   } catch (err) {
-    throw new Error("Not implemented");
+    throw new Error(`Failed to mark card as learned: ${err.message}`);
   }
 }
 
@@ -113,6 +115,6 @@ export function deleteCard(cardId) {
     const info = db.prepare("DELETE FROM cards WHERE id = ?").run(cardId);
     return info.changes > 0;
   } catch (err) {
-    throw new Error("Not implemented");
+    throw new Error(`Failed to delete card: ${err.message}`);
   }
 }