update

backend/database.py

@@ -1,3 +1,5 @@
+import json
+
 import aiosqlite
 from config import DB_PATH
 
@@ -32,6 +34,19 @@ CREATE TABLE IF NOT EXISTS topics (
 )
 """
 
+CREATE_ELEMENTS = """
+CREATE TABLE IF NOT EXISTS elements (
+    id TEXT PRIMARY KEY,
+    topic TEXT NOT NULL,
+    title TEXT NOT NULL,
+    description TEXT NOT NULL DEFAULT '',
+    examples TEXT NOT NULL DEFAULT '[]',
+    hints TEXT NOT NULL DEFAULT '[]',
+    created_at TEXT NOT NULL,
+    updated_at TEXT NOT NULL
+)
+"""
+
 _db: aiosqlite.Connection | None = None
 
 
@@ -48,6 +63,7 @@ async def init_db():
     await db.execute(CREATE_GUIDES)
     await db.execute(CREATE_PROGRESS)
     await db.execute(CREATE_TOPICS)
+    await db.execute(CREATE_ELEMENTS)
     try:  # Migration für Bestands-DBs ohne step-Spalte
         await db.execute("ALTER TABLE guides ADD COLUMN step INTEGER")
     except aiosqlite.OperationalError:
@@ -138,6 +154,63 @@ async def delete_topic(name: str) -> None:
     await db.commit()
 
 
+# --- Elemente ---
+
+def _element_row(row, cursor) -> dict:
+    el = _row_to_dict(row, cursor)
+    el["examples"] = json.loads(el["examples"] or "[]")
+    el["hints"] = json.loads(el["hints"] or "[]")
+    return el
+
+
+async def create_element(element: dict) -> dict:
+    db = await get_db()
+    await db.execute(
+        """INSERT INTO elements (id, topic, title, description, examples, hints, created_at, updated_at)
+           VALUES (:id, :topic, :title, :description, :examples, :hints, :created_at, :updated_at)""",
+        {**element, "examples": json.dumps(element["examples"], ensure_ascii=False),
+         "hints": json.dumps(element["hints"], ensure_ascii=False)},
+    )
+    await db.commit()
+    return element
+
+
+async def list_elements(topic: str) -> list[dict]:
+    db = await get_db()
+    cursor = await db.execute(
+        "SELECT * FROM elements WHERE topic = ? ORDER BY updated_at DESC", (topic,)
+    )
+    rows = await cursor.fetchall()
+    return [_element_row(row, cursor) for row in rows]
+
+
+async def get_element(element_id: str) -> dict | None:
+    db = await get_db()
+    cursor = await db.execute("SELECT * FROM elements WHERE id = ?", (element_id,))
+    row = await cursor.fetchone()
+    if row is None:
+        return None
+    return _element_row(row, cursor)
+
+
+async def update_element(element_id: str, **fields) -> None:
+    for key in ("examples", "hints"):
+        if key in fields:
+            fields[key] = json.dumps(fields[key], ensure_ascii=False)
+    sets = ", ".join(f"{k} = :{k}" for k in fields)
+    fields["id"] = element_id
+    db = await get_db()
+    await db.execute(f"UPDATE elements SET {sets} WHERE id = :id", fields)
+    await db.commit()
+
+
+async def delete_element(element_id: str) -> bool:
+    db = await get_db()
+    cursor = await db.execute("DELETE FROM elements WHERE id = ?", (element_id,))
+    await db.commit()
+    return cursor.rowcount > 0
+
+
 # --- Kapitel-Fortschritt ---
 
 async def list_progress(guide_id: str) -> list[str]: