24 lines
1.6 KiB
SQL
24 lines
1.6 KiB
SQL
CREATE TABLE chats (
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id SERIAL PRIMARY KEY,
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user1_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
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user2_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
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created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
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updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
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UNIQUE(user1_id, user2_id), -- Уникальный чат между двумя пользователями
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CHECK (user1_id < user2_id) -- Предотвращение дублирования чатов (1-2 и 2-1)
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);
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-- Сообщения
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CREATE TABLE messages (
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id SERIAL PRIMARY KEY,
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chat_id INTEGER NOT NULL REFERENCES chats(id) ON DELETE CASCADE,
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sender_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
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receiver_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
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content TEXT NOT NULL,
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status VARCHAR(20) NOT NULL DEFAULT 'sent' CHECK (status IN ('sent', 'delivered', 'read')),
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created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW()
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);
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-- Индексы для производительности
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CREATE INDEX idx_messages_chat_id ON messages(chat_id);
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CREATE INDEX idx_messages_sender_id ON messages(sender_id);
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CREATE INDEX idx_chats_user1_id ON chats(user1_id);
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CREATE INDEX idx_chats_user2_id ON chats(user2_id); |