Implement debt variable management with database integration in DebtCard component

supabase/migrations/20250607008000_add_debt_variables.sql

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+-- Create debt_variables table to store variable values for each debt
+CREATE TABLE IF NOT EXISTS debt_variables (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  debt_id uuid REFERENCES debts(id) ON DELETE CASCADE NOT NULL,
+  variable_name text NOT NULL,
+  variable_value text,
+  created_at timestamptz DEFAULT now(),
+  updated_at timestamptz DEFAULT now(),
+  UNIQUE(debt_id, variable_name)
+);
+
+-- Enable RLS
+ALTER TABLE debt_variables ENABLE ROW LEVEL SECURITY;
+
+-- Create policies for debt_variables
+CREATE POLICY "Users can manage their debt variables"
+  ON debt_variables
+  FOR ALL
+  TO authenticated
+  USING (
+    EXISTS (
+      SELECT 1 FROM debts 
+      WHERE debts.id = debt_variables.debt_id 
+      AND debts.user_id = auth.uid()
+    )
+  )
+  WITH CHECK (
+    EXISTS (
+      SELECT 1 FROM debts 
+      WHERE debts.id = debt_variables.debt_id 
+      AND debts.user_id = auth.uid()
+    )
+  );
+
+-- Create indexes for performance
+CREATE INDEX IF NOT EXISTS idx_debt_variables_debt_id ON debt_variables(debt_id);
+CREATE INDEX IF NOT EXISTS idx_debt_variables_name ON debt_variables(variable_name);
+
+-- Create function to update updated_at timestamp
+CREATE OR REPLACE FUNCTION update_debt_variables_updated_at_column()
+RETURNS TRIGGER AS $$
+BEGIN
+  NEW.updated_at = now();
+  RETURN NEW;
+END;
+$$ language 'plpgsql';
+
+-- Create trigger for updated_at
+DROP TRIGGER IF EXISTS update_debt_variables_updated_at ON debt_variables;
+CREATE TRIGGER update_debt_variables_updated_at
+  BEFORE UPDATE ON debt_variables
+  FOR EACH ROW
+  EXECUTE FUNCTION update_debt_variables_updated_at_column();