Database

Requirements that need to be met by the database of choice:

• NoSQL (since most of the stored data most likely will be unstructured)
• Persistent storage
• Easy to manage and operate
• Relatively inexpencive

Some databases the we considered:

• MongoDB (https://www.mongodb.com) - 512 MB, free
• CockroachDB (https://www.cockroachlabs.com) - 10 GB, free
• Neon (https://neon.tech) - 512 MB, free
• Firestore (https://cloud.google.com/firestore) - 1 GB, free

Also, some object storage solutions:

• Google Storage (https://cloud.google.com/storage) - 5 GB, free
• Storj (https://www.storj.io) - 25 GB, free

Since we don't expect to store large number of data we chose to go with Firestore and Google Storage (in case if we will need object storage for something)