Create user last connection datetime (#935)

Each time the a Grist page is reload the `last_connection_at` of the user is updated

resolve [#924](https://github.com/gristlabs/grist-core/issues/924)

app/gen-server/migration/1663851423064-UserUUID.ts

@@ -1,5 +1,5 @@
-import {User} from 'app/gen-server/entity/User';
 import {makeId} from 'app/server/lib/idUtils';
+import {chunk} from 'lodash';
 import {MigrationInterface, QueryRunner, TableColumn} from "typeorm";
 
 export class UserUUID1663851423064 implements MigrationInterface {
@@ -16,11 +16,20 @@ export class UserUUID1663851423064 implements MigrationInterface {
     // Updating so many rows in a multiple queries is not ideal. We will send updates in chunks.
     // 300 seems to be a good number, for 24k rows we have 80 queries.
     const userList = await queryRunner.manager.createQueryBuilder()
-      .select("users")
-      .from(User, "users")
+      .select(["users.id", "users.ref"])
+      .from("users", "users")
       .getMany();
     userList.forEach(u => u.ref = makeId());
-    await queryRunner.manager.save(userList, { chunk: 300 });
+
+    const userChunks = chunk(userList, 300);
+    for (const users of userChunks) {
+      await queryRunner.connection.transaction(async manager => {
+        const queries = users.map((user: any, _index: number, _array: any[]) => {
+          return queryRunner.manager.update("users", user.id, user);
+        });
+        await Promise.all(queries);
+      });
+    }
 
     // We are not making this column unique yet, because it can fail
     // if there are some old workers still running, and any new user

app/gen-server/migration/1664528376930-UserRefUnique.ts

@@ -1,5 +1,5 @@
-import {User} from 'app/gen-server/entity/User';
 import {makeId} from 'app/server/lib/idUtils';
+import {chunk} from 'lodash';
 import {MigrationInterface, QueryRunner} from "typeorm";
 
 export class UserRefUnique1664528376930 implements MigrationInterface {
@@ -9,12 +9,21 @@ export class UserRefUnique1664528376930 implements MigrationInterface {
 
     // Update users that don't have unique ref set.
     const userList = await queryRunner.manager.createQueryBuilder()
-      .select("users")
-      .from(User, "users")
-      .where("ref is null")
-      .getMany();
+    .select(["users.id", "users.ref"])
+    .from("users", "users")
+    .where("users.ref is null")
+    .getMany();
     userList.forEach(u => u.ref = makeId());
-    await queryRunner.manager.save(userList, {chunk: 300});
+
+    const userChunks = chunk(userList, 300);
+    for (const users of userChunks) {
+      await queryRunner.connection.transaction(async manager => {
+        const queries = users.map((user: any, _index: number, _array: any[]) => {
+          return queryRunner.manager.update("users", user.id, user);
+        });
+        await Promise.all(queries);
+      });
+    }
 
     // Mark column as unique and non-nullable.
     const users = (await queryRunner.getTable('users'))!;

app/gen-server/migration/1713186031023-UserLastConnection.ts

@@ -0,0 +1,18 @@
+import {MigrationInterface, QueryRunner, TableColumn} from 'typeorm';
+
+export class UserLastConnection1713186031023 implements MigrationInterface {
+
+  public async up(queryRunner: QueryRunner): Promise<any> {
+    const sqlite = queryRunner.connection.driver.options.type === 'sqlite';
+    const datetime = sqlite ? "datetime" : "timestamp with time zone";
+    await queryRunner.addColumn('users', new TableColumn({
+      name: 'last_connection_at',
+      type: datetime,
+      isNullable: true
+    }));
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<any> {
+    await queryRunner.dropColumn('users', 'last_connection_at');
+  }
+}