keystone not working after heroku deployment

[datadu-de]

2021-04-03T20:31:24.982547+00:00 app[web.1]: 
2021-04-03T20:31:24.982565+00:00 app[web.1]: > [email protected] prestart /app
2021-04-03T20:31:24.982565+00:00 app[web.1]: > npm run initialise_db
2021-04-03T20:31:24.982566+00:00 app[web.1]: 
2021-04-03T20:31:25.343799+00:00 app[web.1]: 
2021-04-03T20:31:25.343849+00:00 app[web.1]: > [email protected] initialise_db /app
2021-04-03T20:31:25.343850+00:00 app[web.1]: > knex seed:run && knex migrate:up
2021-04-03T20:31:25.343851+00:00 app[web.1]: 
2021-04-03T20:31:57.570539+00:00 app[web.1]: Could not connect to database: 'xxx'
2021-04-03T20:31:57.571038+00:00 app[web.1]: If this is the first time you've run Keystone, you can create your database with the following command:
2021-04-03T20:31:57.571134+00:00 app[web.1]: createdb xxx
2021-04-03T20:31:57.571668+00:00 app[web.1]: Error: Error while executing "/app/data/seeds/initial_data.js" seed: Knex: Timeout acquiring a connection. The pool is probably full. Are you missing a .transacting(trx) call?
2021-04-03T20:31:57.571669+00:00 app[web.1]:     at Seeder._waterfallBatch (/app/node_modules/knex/lib/seed/Seeder.js:118:23)
2021-04-03T20:31:57.571670+00:00 app[web.1]: Error: Knex: Timeout acquiring a connection. The pool is probably full. Are you missing a .transacting(trx) call?
2021-04-03T20:31:57.571671+00:00 app[web.1]:     at /app/node_modules/@keystonejs/utils/dist/utils.cjs.prod.js:45:97
2021-04-03T20:31:57.571671+00:00 app[web.1]:     at async Object.exports.seed (/app/data/seeds/initial_data.js:10:3)
2021-04-03T20:31:57.571672+00:00 app[web.1]:     at async Seeder._waterfallBatch (/app/node_modules/knex/lib/seed/Seeder.js:115:9)
2021-04-03T20:31:57.589002+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2021-04-03T20:31:57.589342+00:00 app[web.1]: npm ERR! errno 1
2021-04-03T20:31:57.595322+00:00 app[web.1]: npm ERR! [email protected] initialise_db: `knex seed:run && knex migrate:up`
2021-04-03T20:31:57.595402+00:00 app[web.1]: npm ERR! Exit status 1
2021-04-03T20:31:57.595518+00:00 app[web.1]: npm ERR! 
2021-04-03T20:31:57.595595+00:00 app[web.1]: npm ERR! Failed at the [email protected] initialise_db script.
2021-04-03T20:31:57.595686+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2021-04-03T20:31:57.603710+00:00 app[web.1]: 
2021-04-03T20:31:57.604015+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2021-04-03T20:31:57.604159+00:00 app[web.1]: npm ERR!     /app/.npm/_logs/2021-04-03T20_31_57_596Z-debug.log
2021-04-03T20:31:57.617713+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2021-04-03T20:31:57.617990+00:00 app[web.1]: npm ERR! errno 1
2021-04-03T20:31:57.623283+00:00 app[web.1]: npm ERR! [email protected] prestart: `npm run initialise_db`
2021-04-03T20:31:57.623364+00:00 app[web.1]: npm ERR! Exit status 1
2021-04-03T20:31:57.623466+00:00 app[web.1]: npm ERR! 
2021-04-03T20:31:57.623549+00:00 app[web.1]: npm ERR! Failed at the [email protected] prestart script.
2021-04-03T20:31:57.623616+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2021-04-03T20:31:57.629937+00:00 app[web.1]: 
2021-04-03T20:31:57.630158+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2021-04-03T20:31:57.630247+00:00 app[web.1]: npm ERR!     /app/.npm/_logs/2021-04-03T20_31_57_624Z-debug.log
2021-04-03T20:31:57.710482+00:00 heroku[web.1]: Process exited with status 1
2021-04-03T20:31:57.765381+00:00 heroku[web.1]: State changed from starting to crashed