first commit

client/models/chats/participant.py

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+import sqlite3
+from dataclasses import dataclass
+from typing import Optional, List
+
+@dataclass
+class ParticipantModel:
+    conversation_id: Optional[int] = None
+    user_id: Optional[int] = None
+    joined_at: Optional[str] = None
+
+class Participants:
+    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 participants (
+                    conversation_id INTEGER,
+                    user_id INTEGER,
+                    joined_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+                    PRIMARY KEY (conversation_id, user_id),
+                    FOREIGN KEY (conversation_id) REFERENCES conversations(id) ON DELETE CASCADE,
+                    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+                );
+            """)
+            conn.commit()
+
+    def add_user(self, conversation_id: int, user_id: int):
+        with sqlite3.connect(self.db_path) as conn:
+            conn.execute(
+                "INSERT OR IGNORE INTO participants (conversation_id, user_id) VALUES (?, ?)",
+                (conversation_id, user_id)
+            )
+
+    def get_conversation_members(self, conversation_id: int) -> List[int]:
+        with sqlite3.connect(self.db_path) as conn:
+            cursor = conn.cursor()
+            cursor.execute("SELECT user_id FROM participants WHERE conversation_id = ?", (conversation_id,))
+            return [row[0] for row in cursor.fetchall()]
+
+    def remove_user(self, conversation_id: int, user_id: int):
+        with sqlite3.connect(self.db_path) as conn:
+            conn.execute(
+                "DELETE FROM participants WHERE conversation_id = ? AND user_id = ?",
+                (conversation_id, user_id)
+            )