Implement cleaning to set all historic negative balances to zero

postgres/budgets.sql.go

@@ -5,6 +5,7 @@ package postgres
 
 import (
 	"context"
+	"time"
 
 	"github.com/google/uuid"
 )
@@ -78,3 +79,26 @@ func (q *Queries) GetBudgetsForUser(ctx context.Context, userID uuid.UUID) ([]Bu
 	}
 	return items, nil
 }
+
+const getFirstActivity = `-- name: GetFirstActivity :one
+SELECT MIN(dates.min_date)::date as min_date
+FROM (
+        SELECT MIN(assignments.date) as min_date
+        FROM assignments
+        INNER JOIN categories ON categories.id = assignments.category_id
+        INNER JOIN category_groups ON category_groups.id = categories.category_group_id
+        WHERE category_groups.budget_id = $1
+        UNION
+        SELECT MIN(transactions.date) as min_date
+        FROM transactions
+        INNER JOIN accounts ON accounts.id = transactions.account_id
+        WHERE accounts.budget_id = $1
+) dates
+`
+
+func (q *Queries) GetFirstActivity(ctx context.Context, budgetID uuid.UUID) (time.Time, error) {
+	row := q.db.QueryRowContext(ctx, getFirstActivity, budgetID)
+	var min_date time.Time
+	err := row.Scan(&min_date)
+	return min_date, err
+}

postgres/numeric.go

@@ -18,7 +18,7 @@ func (n Numeric) GetFloat64() float64 {
 	return balance
 }
 
-func (n Numeric) GetPositive() bool {
+func (n Numeric) IsPositive() bool {
 	if n.Status != pgtype.Present {
 		return true
 	}

postgres/queries/budgets.sql

@@ -11,4 +11,19 @@ WHERE user_budgets.user_id = $1;
 
 -- name: GetBudget :one
 SELECT * FROM budgets 
-WHERE id = $1;
+WHERE id = $1;
+
+-- name: GetFirstActivity :one
+SELECT MIN(dates.min_date)::date as min_date
+FROM (
+        SELECT MIN(assignments.date) as min_date
+        FROM assignments
+        INNER JOIN categories ON categories.id = assignments.category_id
+        INNER JOIN category_groups ON category_groups.id = categories.category_group_id
+        WHERE category_groups.budget_id = @budget_id
+        UNION
+        SELECT MIN(transactions.date) as min_date
+        FROM transactions
+        INNER JOIN accounts ON accounts.id = transactions.account_id
+        WHERE accounts.budget_id = @budget_id
+) dates;