diff --git a/src/models.py b/src/models.py
index 2ae2839..2cef1d7 100644
--- a/src/models.py
+++ b/src/models.py
@@ -1 +1,74 @@
-pass
+import json
+from datetime import datetime, date, timezone
+from app import db
+
+
+class Article(db.Model):
+    __tablename__ = "articles"
+
+    id = db.Column(db.Integer, primary_key=True)
+    guid = db.Column(db.Text, unique=True, nullable=False)
+    title = db.Column(db.Text, nullable=False)
+    author = db.Column(db.Text, nullable=False)
+    pub_date = db.Column(db.DateTime, nullable=False)
+    categories = db.Column(db.Text, nullable=False, default="[]")
+    link = db.Column(db.Text, nullable=False)
+    content_html = db.Column(db.Text, nullable=False, default="")
+    fetched_at = db.Column(
+        db.DateTime, nullable=False, default=lambda: datetime.now(timezone.utc)
+    )
+
+    images = db.relationship("Image", backref="article", lazy=True,
+                             cascade="all, delete-orphan")
+
+
+class Image(db.Model):
+    __tablename__ = "images"
+
+    id = db.Column(db.Integer, primary_key=True)
+    article_id = db.Column(db.Integer, db.ForeignKey("articles.id"), nullable=False)
+    original_url = db.Column(db.Text, nullable=False)
+    local_path = db.Column(db.Text, nullable=False)
+    width = db.Column(db.Integer, nullable=False)
+    height = db.Column(db.Integer, nullable=False)
+
+
+class Issue(db.Model):
+    __tablename__ = "issues"
+
+    id = db.Column(db.Integer, primary_key=True)
+    week_start = db.Column(db.Date, nullable=False)
+    week_end = db.Column(db.Date, nullable=False)
+    cover_method = db.Column(db.Text, nullable=False)
+    cover_path = db.Column(db.Text, nullable=False)
+    epub_path = db.Column(db.Text, nullable=False)
+    article_ids = db.Column(db.Text, nullable=False, default="[]")
+    excluded_article_ids = db.Column(db.Text, nullable=False, default="[]")
+    created_at = db.Column(
+        db.DateTime, nullable=False, default=lambda: datetime.now(timezone.utc)
+    )
+    status = db.Column(db.Text, nullable=False, default="draft")
+
+
+class Setting(db.Model):
+    __tablename__ = "settings"
+
+    key = db.Column(db.Text, primary_key=True)
+    value = db.Column(db.Text, nullable=False)
+
+    @staticmethod
+    def get(key, default=None):
+        row = Setting.query.get(key)
+        if row is None:
+            return default
+        return json.loads(row.value)
+
+    @staticmethod
+    def set(key, value):
+        row = Setting.query.get(key)
+        if row is None:
+            row = Setting(key=key, value=json.dumps(value))
+            db.session.add(row)
+        else:
+            row.value = json.dumps(value)
+        db.session.commit()
diff --git a/tests/test_models.py b/tests/test_models.py
new file mode 100644
index 0000000..3d06413
--- /dev/null
+++ b/tests/test_models.py
@@ -0,0 +1,86 @@
+import json
+from datetime import datetime, date
+from src.models import Article, Image, Issue, Setting
+
+
+def test_create_article(db):
+    article = Article(
+        guid="https://example.com/?p=100",
+        title="Test Article",
+        author="Test Author",
+        pub_date=datetime(2026, 4, 6, 12, 0, 0),
+        categories=json.dumps(["Government"]),
+        link="https://example.com/test",
+        content_html="<p>Test content</p>",
+    )
+    db.session.add(article)
+    db.session.commit()
+
+    saved = Article.query.filter_by(guid="https://example.com/?p=100").first()
+    assert saved is not None
+    assert saved.title == "Test Article"
+    assert saved.author == "Test Author"
+    assert json.loads(saved.categories) == ["Government"]
+    assert saved.fetched_at is not None
+
+
+def test_article_guid_unique(db):
+    a1 = Article(guid="dup", title="A", author="X", pub_date=datetime.now(),
+                 categories="[]", link="http://a", content_html="")
+    a2 = Article(guid="dup", title="B", author="Y", pub_date=datetime.now(),
+                 categories="[]", link="http://b", content_html="")
+    db.session.add(a1)
+    db.session.commit()
+    db.session.add(a2)
+    try:
+        db.session.commit()
+        assert False, "Should have raised IntegrityError"
+    except Exception:
+        db.session.rollback()
+
+
+def test_create_image(db):
+    article = Article(guid="img-test", title="A", author="X",
+                      pub_date=datetime.now(), categories="[]",
+                      link="http://a", content_html="")
+    db.session.add(article)
+    db.session.commit()
+
+    img = Image(
+        article_id=article.id,
+        original_url="https://example.com/photo.jpg",
+        local_path="data/images/abc123.jpg",
+        width=800,
+        height=450,
+    )
+    db.session.add(img)
+    db.session.commit()
+
+    assert img.id is not None
+    assert img.article.guid == "img-test"
+
+
+def test_create_issue(db):
+    issue = Issue(
+        week_start=date(2026, 4, 6),
+        week_end=date(2026, 4, 12),
+        cover_method="text",
+        cover_path="data/issues/cover.jpg",
+        epub_path="data/issues/test.epub",
+        article_ids=json.dumps([1, 2, 3]),
+        excluded_article_ids=json.dumps([]),
+        status="published",
+    )
+    db.session.add(issue)
+    db.session.commit()
+    assert issue.id is not None
+    assert issue.created_at is not None
+
+
+def test_setting_crud(db):
+    Setting.set("fetch_interval", 2)
+    assert Setting.get("fetch_interval") == 2
+    assert Setting.get("nonexistent", default="fallback") == "fallback"
+
+    Setting.set("fetch_interval", 4)
+    assert Setting.get("fetch_interval") == 4