fix: 00013 migration file

internal/db/migrations/00013_budget_tags_table.sql

@@ -1,4 +1,31 @@
 -- +goose Up
+-- Drop index before rename (SQLite keeps index names after table rename)
+DROP INDEX IF EXISTS idx_budgets_space_id;
+
+-- Rename old budgets table so we can recreate it without tag_id
+ALTER TABLE budgets RENAME TO budgets_old;
+
+-- Recreate budgets table without tag_id (SQLite can't DROP COLUMN with constraints)
+CREATE TABLE budgets (
+    id TEXT PRIMARY KEY NOT NULL,
+    space_id TEXT NOT NULL,
+    amount_cents INTEGER NOT NULL,
+    period TEXT NOT NULL CHECK (period IN ('weekly', 'monthly', 'yearly')),
+    start_date DATE NOT NULL,
+    end_date DATE,
+    is_active BOOLEAN NOT NULL DEFAULT TRUE,
+    created_by TEXT NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (space_id) REFERENCES spaces(id) ON DELETE CASCADE,
+    FOREIGN KEY (created_by) REFERENCES users(id) ON DELETE CASCADE
+);
+
+INSERT INTO budgets (id, space_id, amount_cents, period, start_date, end_date, is_active, created_by, created_at, updated_at)
+SELECT id, space_id, amount_cents, period, start_date, end_date, is_active, created_by, created_at, updated_at FROM budgets_old;
+
+CREATE INDEX idx_budgets_space_id ON budgets(space_id);
+
 -- Create budget_tags join table for many-to-many relationship
 CREATE TABLE budget_tags (
     budget_id TEXT NOT NULL,
@@ -12,27 +39,54 @@ CREATE INDEX idx_budget_tags_tag_id ON budget_tags(tag_id);
 
 -- Migrate existing tag_id data to the join table
 INSERT INTO budget_tags (budget_id, tag_id)
-SELECT id, tag_id FROM budgets WHERE tag_id IS NOT NULL;
+SELECT id, tag_id FROM budgets_old WHERE tag_id IS NOT NULL;
 
--- Drop the unique constraint and FK that reference tag_id, then drop the column
-ALTER TABLE budgets DROP CONSTRAINT budgets_space_id_tag_id_period_key;
-ALTER TABLE budgets DROP CONSTRAINT budgets_tag_id_fkey;
-ALTER TABLE budgets DROP COLUMN tag_id;
+-- Drop the old table (nothing references it now)
+DROP TABLE budgets_old;
 
 -- +goose Down
--- Add tag_id column back
-ALTER TABLE budgets ADD COLUMN tag_id TEXT;
+-- Drop budget_tags first (it references budgets)
+DROP INDEX IF EXISTS idx_budget_tags_tag_id;
 
--- Copy first tag back from budget_tags
-UPDATE budgets SET tag_id = (
-    SELECT tag_id FROM budget_tags WHERE budget_tags.budget_id = budgets.id LIMIT 1
+-- Save tag mappings before dropping budget_tags
+CREATE TEMP TABLE budget_tag_mappings AS
+SELECT budget_id, tag_id FROM budget_tags;
+
+DROP TABLE budget_tags;
+
+-- Drop index before rename (SQLite keeps index names after table rename)
+DROP INDEX IF EXISTS idx_budgets_space_id;
+
+-- Rename current budgets out of the way
+ALTER TABLE budgets RENAME TO budgets_new;
+
+-- Recreate budgets table with tag_id column
+CREATE TABLE budgets (
+    id TEXT PRIMARY KEY NOT NULL,
+    space_id TEXT NOT NULL,
+    tag_id TEXT NOT NULL,
+    amount_cents INTEGER NOT NULL,
+    period TEXT NOT NULL CHECK (period IN ('weekly', 'monthly', 'yearly')),
+    start_date DATE NOT NULL,
+    end_date DATE,
+    is_active BOOLEAN NOT NULL DEFAULT TRUE,
+    created_by TEXT NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE(space_id, tag_id, period),
+    FOREIGN KEY (space_id) REFERENCES spaces(id) ON DELETE CASCADE,
+    FOREIGN KEY (tag_id) REFERENCES tags(id) ON DELETE CASCADE,
+    FOREIGN KEY (created_by) REFERENCES users(id) ON DELETE CASCADE
 );
 
--- Re-add FK and unique constraint
-ALTER TABLE budgets ADD CONSTRAINT budgets_tag_id_fkey
-    FOREIGN KEY (tag_id) REFERENCES tags(id) ON DELETE CASCADE;
-ALTER TABLE budgets ADD CONSTRAINT budgets_space_id_tag_id_period_key
-    UNIQUE (space_id, tag_id, period);
+-- Copy data back, restoring first tag from saved mappings
+INSERT INTO budgets (id, space_id, tag_id, amount_cents, period, start_date, end_date, is_active, created_by, created_at, updated_at)
+SELECT b.id, b.space_id,
+    COALESCE((SELECT m.tag_id FROM budget_tag_mappings m WHERE m.budget_id = b.id LIMIT 1), ''),
+    b.amount_cents, b.period, b.start_date, b.end_date, b.is_active, b.created_by, b.created_at, b.updated_at
+FROM budgets_new b;
 
-DROP INDEX IF EXISTS idx_budget_tags_tag_id;
-DROP TABLE IF EXISTS budget_tags;
+CREATE INDEX idx_budgets_space_id ON budgets(space_id);
+
+DROP TABLE budgets_new;
+DROP TABLE budget_tag_mappings;