Create postgre_queries_triggers.sql

Author: kuldeep27396

postgre_queries_triggers.sql

@@ -0,0 +1,110 @@
+-- Users Table
+CREATE TABLE users (
+    id SERIAL PRIMARY KEY,
+    username VARCHAR(50) UNIQUE NOT NULL,
+    email VARCHAR(100) UNIQUE NOT NULL,
+    password_hash VARCHAR(255) NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_users_email ON users(email);
+
+-- Groups Table
+CREATE TABLE groups (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    description TEXT,
+    created_by INTEGER REFERENCES users(id),
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_groups_created_by ON groups(created_by);
+
+-- User_Group Table (for many-to-many relationship between users and groups)
+CREATE TABLE user_group (
+    user_id INTEGER REFERENCES users(id) ON DELETE CASCADE,
+    group_id INTEGER REFERENCES groups(id) ON DELETE CASCADE,
+    role VARCHAR(20) DEFAULT 'MEMBER',
+    joined_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (user_id, group_id)
+);
+
+CREATE INDEX idx_user_group_user_id ON user_group(user_id);
+CREATE INDEX idx_user_group_group_id ON user_group(group_id);
+
+-- Expenses Table
+CREATE TABLE expenses (
+    id SERIAL PRIMARY KEY,
+    group_id INTEGER REFERENCES groups(id) ON DELETE CASCADE,
+    payer_id INTEGER REFERENCES users(id),
+    amount DECIMAL(10, 2) NOT NULL,
+    description TEXT NOT NULL,
+    date TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_expenses_group_id ON expenses(group_id);
+CREATE INDEX idx_expenses_payer_id ON expenses(payer_id);
+
+-- Expense_Splits Table
+CREATE TABLE expense_splits (
+    id SERIAL PRIMARY KEY,
+    expense_id INTEGER REFERENCES expenses(id) ON DELETE CASCADE,
+    user_id INTEGER REFERENCES users(id),
+    amount DECIMAL(10, 2) NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_expense_splits_expense_id ON expense_splits(expense_id);
+CREATE INDEX idx_expense_splits_user_id ON expense_splits(user_id);
+
+-- Settlements Table
+CREATE TABLE settlements (
+    id SERIAL PRIMARY KEY,
+    payer_id INTEGER REFERENCES users(id),
+    payee_id INTEGER REFERENCES users(id),
+    amount DECIMAL(10, 2) NOT NULL,
+    group_id INTEGER REFERENCES groups(id),
+    settled_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_settlements_payer_id ON settlements(payer_id);
+CREATE INDEX idx_settlements_payee_id ON settlements(payee_id);
+CREATE INDEX idx_settlements_group_id ON settlements(group_id);
+
+-- Categories Table
+CREATE TABLE categories (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(50) UNIQUE NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Add category_id to Expenses Table
+ALTER TABLE expenses
+ADD COLUMN category_id INTEGER REFERENCES categories(id);
+
+CREATE INDEX idx_expenses_category_id ON expenses(category_id);
+
+-- Create a function to update the updated_at timestamp
+CREATE OR REPLACE FUNCTION update_modified_column()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = now();
+    RETURN NEW;
+END;
+$$ language 'plpgsql';
+
+-- Create triggers to automatically update the updated_at column
+CREATE TRIGGER update_user_modtime BEFORE UPDATE ON users FOR EACH ROW EXECUTE FUNCTION update_modified_column();
+CREATE TRIGGER update_group_modtime BEFORE UPDATE ON groups FOR EACH ROW EXECUTE FUNCTION update_modified_column();
+CREATE TRIGGER update_expense_modtime BEFORE UPDATE ON expenses FOR EACH ROW EXECUTE FUNCTION update_modified_column();
+CREATE TRIGGER update_expense_split_modtime BEFORE UPDATE ON expense_splits FOR EACH ROW EXECUTE FUNCTION update_modified_column();
+CREATE TRIGGER update_settlement_modtime BEFORE UPDATE ON settlements FOR EACH ROW EXECUTE FUNCTION update_modified_column();
+CREATE TRIGGER update_category_modtime BEFORE UPDATE ON categories FOR EACH ROW EXECUTE FUNCTION update_modified_column();