fixed

backend/scripts/migrate-pg-to-sqlite.js

@@ -100,6 +100,63 @@ async function tableExists(sqlite, name) {
   return Array.isArray(rows) && rows.length > 0;
 }
 
+function colSetKey(cols) {
+  return [...cols].sort().join(',');
+}
+
+/** Detect old/broken SQLite schemas (e.g. UNIQUE(group_id) only → one row per group). */
+async function groupMembersSqliteNeedsRepair(sqlite) {
+  const list = await sqlite.query(`PRAGMA index_list('group_members')`, { type: QueryTypes.SELECT });
+  let hasGroupUser = false;
+  let hasGroupMemberNum = false;
+  let badGroupIdOnly = false;
+
+  for (const row of list) {
+    const unique = row.unique === 1 || row.unique === true;
+    if (!unique) continue;
+    const info = await sqlite.query(`PRAGMA index_info('${String(row.name).replace(/'/g, "''")}')`, {
+      type: QueryTypes.SELECT,
+    });
+    const cols = info
+      .slice()
+      .sort((a, b) => (a.seqno ?? 0) - (b.seqno ?? 0))
+      .map((i) => i.name)
+      .filter(Boolean);
+    if (cols.length === 1 && cols[0] === 'group_id') {
+      badGroupIdOnly = true;
+    }
+    if (colSetKey(cols) === 'group_id,user_id') hasGroupUser = true;
+    if (colSetKey(cols) === 'group_id,member_number') hasGroupMemberNum = true;
+  }
+
+  return badGroupIdOnly || !hasGroupUser || !hasGroupMemberNum;
+}
+
+/** Must match `src/models/GroupMember.js` + Sequelize SQLite DDL (table is empty). */
+async function recreateGroupMembersTable(sqlite) {
+  await sqlite.query('DROP TABLE IF EXISTS `group_members`');
+  await sqlite.query(`
+    CREATE TABLE \`group_members\` (
+      \`id\` UUID PRIMARY KEY,
+      \`group_id\` UUID NOT NULL REFERENCES \`chit_groups\` (\`id\`) ON DELETE CASCADE ON UPDATE CASCADE,
+      \`user_id\` UUID NOT NULL REFERENCES \`users\` (\`id\`) ON DELETE CASCADE ON UPDATE CASCADE,
+      \`member_number\` INTEGER NOT NULL,
+      \`joined_date\` DATETIME NOT NULL,
+      \`status\` TEXT DEFAULT 'active',
+      \`total_paid\` DECIMAL(15,2) DEFAULT 0,
+      \`total_won\` DECIMAL(15,2) DEFAULT 0,
+      \`created_at\` DATETIME NOT NULL,
+      \`updated_at\` DATETIME NOT NULL
+    )
+  `);
+  await sqlite.query(
+    'CREATE UNIQUE INDEX `group_members_group_id_user_id` ON `group_members` (`group_id`, `user_id`)'
+  );
+  await sqlite.query(
+    'CREATE UNIQUE INDEX `group_members_group_id_member_number` ON `group_members` (`group_id`, `member_number`)'
+  );
+}
+
 async function fetchPostgresTable(pg, table) {
   try {
     return await pg.query(`SELECT * FROM "${table}"`, { type: QueryTypes.SELECT });
@@ -187,6 +244,15 @@ async function main() {
   }
   console.log('   Done.\n');
 
+  if (await groupMembersSqliteNeedsRepair(sqlite)) {
+    console.log(
+      '🔧 Fixing `group_members` SQLite schema (wrong UNIQUE on `group_id` or missing composite indexes).\n' +
+        '   Recreating empty table to match current Sequelize model…\n'
+    );
+    await recreateGroupMembersTable(sqlite);
+    console.log('   Done.\n');
+  }
+
   console.log('📥 Copying from PostgreSQL → SQLite…\n');
   for (const table of TABLES_ORDER) {
     const rows = await fetchPostgresTable(pg, table);