feat(api): insert members into database + testing

backend/src/neo_neo_todo/models/member.py

@@ -55,3 +55,34 @@ async def select_member_by_id(db: AsyncConnectionPool, id: int) -> Member | None
             member = await curr.fetchone()
 
             return None if member is None else member
+
+
+async def insert_member(
+    db: AsyncConnectionPool, email: str, password_hash: str
+) -> Member | None:
+    """
+    Insert a member into the database
+
+    Return the inserted member object
+    """
+    async with db.connection() as conn:
+        async with conn.cursor(row_factory=class_row(Member)) as curr:
+            query = sql.SQL(
+                """
+                INSERT INTO members (email, password_hash)
+                    VALUES (%s, %s)
+                    RETURNING id, email, password_hash, created, email_verified
+                """
+            )
+
+            await curr.execute(
+                query,
+                (
+                    email,
+                    password_hash,
+                ),
+            )
+
+            member = await curr.fetchone()
+
+            return None if member is None else member