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As you found out, this new requirement can not be satisfied with your current architecture (no local database) and the external API which would be the right place where statistics should be computed and … The effort to implement a solution within your system is considerable, and depending on your relationship with the provider of the external API and the number of entities querying all entities regularly …

There are a couple of good answers already, here's an additional idea that might make sense: treat the cache as a resource of service B that has an attribute "valid". Signal the need for re-caching by …

API versions should only be incremented when you change the API in a non-backward compatible way, and expect to switch clients from the old to the new version over a limited timespan, during which you … For example, your endpoint might look like /api/v1/student/...?details_format=format_1 to select a specific . …

In a REST API, I would normally use hierarchical resource names to access owned resources, such as customer/100/invoice/1 but YMMV. … But the role names owner and owned shouldn't appear anywhere in the API. …

For endpoints denoting a single resource, such as /products/{productId} it's best to return this resource, not a list. If it does not exist, a 404 error is appropriate. If you'd access the resource us …

Just add a query parameter (e.g. modified_after) that the client can use to fetch only items that have changed since the last time. The modification time should be part of the item's data, so the cli …

For examples of how the second approach is being used in API design, have a look at the OpenAPI spec regarding API responses (see https://swagger.io/docs/specification/describing-responses/ under "Default … If you take that as a general direction for API design, your second approach would be better. …

You're starting from a wrong assumption. If you want to access resources by ID, every resource should have an ID. The VIN isn't necessarily the right choice for an ID attribute, you will most likely n …

Do you really want to create cron jobs (i.e. jobs that are executed at regular intervals until they are removed/disabled again) or just single actions that should run at a specified time? If the latte …

Use the int variable, even if signalling and reading is a little more complex. The boolean solutions both have race conditions where events will be missed, and a more complex protocol would likely inc …

I don't know which database you're using, but is it possible to define stored procedures in different schemas (essentially namespaces) and give them access to the underlying data through synonyms? At …

In your diagram it's somewhat unclear in which direction the data flows. Your arrows are bidirectional, does that mean each participant sends as well as receives files? It is also not clear which part …

If the user retrieves the range and enters it into your API (copy&paste?) … If your application retrieves that range, it is your responsibility to interpret it according to their API and transform it appropriately before passing on to the other API. …

Depending on what purpose the external services serve in your application, you may enable/disable them via some configuration. For optional services this may even prove useful in production environmen …

For fast response time and high throughput, it's actually best to keep database connections open and reuse them for subsequent requests. Most database frameworks offer some kind of connection pool mec …