initial commit

migrations/20250704000000_init.sql

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+-- Create accounts table
+CREATE TABLE accounts (
+    account_id BIGINT PRIMARY KEY,
+    balance DECIMAL(20, 2) NOT NULL
+);
+
+-- Create transactions table for audit purposes
+CREATE TABLE transactions (
+    transaction_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    source_account_id BIGINT NOT NULL,
+    destination_account_id BIGINT NOT NULL,
+    amount DECIMAL(20, 2) NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
+    FOREIGN KEY (source_account_id) REFERENCES accounts (account_id),
+    FOREIGN KEY (destination_account_id) REFERENCES accounts (account_id)
+);