first commit

client/models/chats/conversation.py

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+import sqlite3
+from dataclasses import dataclass
+from typing import Optional, List
+
+@dataclass
+class ConversationModel:
+    id: Optional[int] = None
+    is_group: Optional[int] = None
+    name: Optional[str] = None
+    created_at: Optional[str] = None
+
+class Conversations:
+    def __init__(self, db_path="instance/app_database.db"):
+        self.db_path = db_path
+        self._create_tables()
+
+    def _create_tables(self):
+        with sqlite3.connect(self.db_path) as conn:
+            cursor = conn.cursor()
+            cursor.execute("""
+                CREATE TABLE IF NOT EXISTS conversations (
+                    id INTEGER PRIMARY KEY AUTOINCREMENT,
+                    is_group INTEGER DEFAULT 0,
+                    name TEXT,
+                    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+                );
+            """)
+            conn.commit()
+
+    def create(self, is_group: int, name: Optional[str] = None) -> int:
+        with sqlite3.connect(self.db_path) as conn:
+            cursor = conn.cursor()
+            cursor.execute(
+                "INSERT INTO conversations (is_group, name) VALUES (?, ?)",
+                (is_group, name)
+            )
+            return cursor.lastrowid
+
+    def get_by_id(self, conv_id: int) -> Optional[ConversationModel]:
+        with sqlite3.connect(self.db_path) as conn:
+            conn.row_factory = sqlite3.Row
+            cursor = conn.cursor()
+            cursor.execute("SELECT * FROM conversations WHERE id = ?", (conv_id,))
+            row = cursor.fetchone()
+            return ConversationModel(**dict(row)) if row else None
+
+    def delete(self, conv_id: int):
+        with sqlite3.connect(self.db_path) as conn:
+            conn.execute("DELETE FROM conversations WHERE id = ?", (conv_id,))