yea it does that often x) btw its fine theres no data on it yet really i can recreate it until its

yea it does that often x)

btw its fine theres no data on it yet really i can recreate it until its in europe. just wanted to give the feedback

SSilvan yea it does that often x) btw its fine theres no data on it yet really i can re...

lambrospetrou•6/25/25, 9:26 AM

From what I see, the location hint that came through to the D1 API was WNAM

SilvanOP•6/25/25, 9:28 AM

hm weird. maybe i did click the wrong one afterall

SSilvan hm weird. maybe i did click the wrong one afterall

lambrospetrou•6/25/25, 9:30 AM

I created one in WEUR in the dashboard and it works, so maybe it was a misclick indeed. If you manage to reproduce it let us know, though, to dig deeper.

SilvanOP•6/25/25, 9:31 AM

yea very well possible i just read west and clicked it. thanks for checking anyway!

ajgeiss0702•6/26/25, 12:30 AM

it looks like the new database studio thing removes newlines from strings when editing them

Aajgeiss0702 it looks like the new database studio thing removes newlines from strings when e...

Brayden•6/26/25, 12:38 AM

We'll investigate this

Aajgeiss0702 it looks like the new database studio thing removes newlines from strings when e...

Visal .In•6/26/25, 1:14 AM

At the moment, the studio hasn't implemented the multiple line editor yet. It is on our upcoming roadmap. Can expected it in the next 2 weeks.

silversoul•6/26/25, 3:20 PM

I just created my first d1 migration and I ran wrangler d1 migrations create my-db "Migration message"wrangler d1 migrations create my-db "Migration message", then it created a migration file with name: 0NaN_<message>0NaN_<message> like this. Anyone else have this issue ?

wrangler 4.22.0 / typescript

silversoul•6/26/25, 3:23 PM

oooh, it seems that removing "migrations_table""migrations_table" in wrangler.jsonc fixed it

jLynx•6/26/25, 10:48 PM

@Walshy seem to be getting massive timeouts on our D1 database via functions

jLynx•6/26/25, 10:48 PM

unsure if this is a D1 outage or pages outage

jLynx•6/26/25, 11:00 PM

seems to be fine now

Samantas5855•6/28/25, 4:16 PM

Other than jsonjson what other datatypes are there

SilvanOP•6/28/25, 8:22 PM

its not a datatype but we do have the json extension https://developers.cloudflare.com/d1/sql-api/query-json/

Cloudflare Docs

Query JSON

D1 has built-in support for querying and parsing JSON data stored within a database. This enables you to:

SilvanOP•6/28/25, 8:36 PM

The SQLite JSON extension ↗, on which D1 builds on, has additional usage examples.The SQLite JSON extension ↗, on which D1 builds on, has additional usage examples.

SilvanOP•6/28/25, 8:37 PM

pretty sure you have to compile with a flag to get this but dosent really matter

Dio•6/29/25, 11:44 PM

Are embedded replicas planned? I mean something like turso.

DDio Are embedded replicas planned? I mean something like turso.

lambrospetrou•6/30/25, 11:27 AM

No plans at the moment. There are some other companies trying to do sync engines ontop of DOs, so if that fits your use-cases you might want to explore those. I haven't tried any personally, so cannot recommend specific ones.

Original message was deleted

lambrospetrou•6/30/25, 11:29 AM

is using 'first-primary' the equiv of using not using sessions api at all - even if i have replication enabled?

For the first call, yes, they are the same.

If you continue using the same session object though, your subsequent queries will potentially be processed by a replica that is at least up-to-date as your last read/write. If you don't use the sessions API ALL requests are going to the primary (treated as first-primaryfirst-primary).

if 'first-unconstrained' detects a write through sessions will it be upgraded to a primary, thus adding extra latency?

Yes, if a query is a write, we will automatically forward it to the primary for execution. It still flows through the replica location though, so there might be some extra latency (or not) depending on these locations.

Llambrospetrou > is using 'first-primary' the equiv of using not using sessions api at all - ev...

lambrospetrou•6/30/25, 11:31 AM

We have plans to make both the replicas placement better, and also to make the routing smarter so that if writes are detected in the query we send you straight to primary but it's still some time away from being released.

lambrospetrou•6/30/25, 12:47 PM

Hey folks, we released a small improvement last week for read replication and would love to get some feedback, or unexpected encountered issues.

Until last week, requests flowing through your replicas would wait for the replica to startup instead of using the primary until the replica is up and ready, which led to some latency increase for applications without constant traffic.
As of last week, requests now flow to the primary instance while replicas boot up, therefore latencies are expected to be better.

Keep in mind that if your application is doing less than 1 query per minute, your primary will most likely have to cold start often too, this didn't change, so in those cases you will anyway have the same latencies.

Please try it out and let us know if you encounter any issues or unexpected behavior.

Llambrospetrou Hey folks, we released a small improvement last week for read replication and wo...

Zack•6/30/25, 12:53 PM

Awesome! I will give it another go and report back sometime this week

Llambrospetrou Hey folks, we released a small improvement last week for read replication and wo...

Vero•6/30/25, 1:21 PM

@D1 Database

Llambrospetrou > is using 'first-primary' the equiv of using not using sessions api at all - ev...

ajgeiss0702•6/30/25, 3:14 PM

this reminds me.

With the http api, does that work the same as querying from a workers without a session, consistency wise?
i know the http api adds additional latency, but thats not a huge issue with what im using it for. Consistency can be though

Basically, I'm writing to the d1 database from a service running outside of cloudflare, then reading it from workers (on cf pages)

please ping me if you reply

Aajgeiss0702 this reminds me. With the http api, does that work the same as querying from a ...

lambrospetrou•6/30/25, 4:06 PM

The HTTP API does not use Sessions API for now, so all queries go to the primary.
BTW, the latency for queries has improved a lot a few weeks ago so it's not far off from the Workers Binding (still a bit slower though).

ajgeiss0702•6/30/25, 4:06 PM

got it, thanks

SnowBall•6/30/25, 11:29 PM

huh

Original message was deleted

lambrospetrou•7/1/25, 8:41 AM

Yeah, this should work. Read more at https://developers.cloudflare.com/d1/worker-api/d1-database/#batch
Let us know if you find sometihng not working as expected.

Keep in mind the first-unconstrainedfirst-unconstrained means a replica will most likely process the query.

Jumaron•7/1/25, 5:16 PM

How many queries do i need until the read replicas kick in, i still have 0 :/
Using similiar code like quankitt3 from above.
platform.env.DB.withSession(first-unconstrained);
Tried even with bookmarks but sadly nothing works.
Is there a requirement one needs to hit?

JJumaron How many queries do i need until the read replicas kick in, i still have 0 :/ Us...

Chaika•7/1/25, 5:32 PM

Do you have them enabled under Settings -> Replication?

CChaika Do you have them enabled under Settings -> Replication?

Jumaron•7/1/25, 5:33 PM

Yes

JJumaron How many queries do i need until the read replicas kick in, i still have 0 :/ Us...

lambrospetrou•7/1/25, 5:36 PM

There isn't any query limit, once it boots in the region of your requests it should start processing read requests.

Llambrospetrou There isn't any query limit, once it boots in the region of your requests it sho...

Jumaron•7/1/25, 5:36 PM

hmm, I use sveltekit maybe its because of that?

Llambrospetrou There isn't any query limit, once it boots in the region of your requests it sho...

lambrospetrou•7/1/25, 5:36 PM

DM me your account and database IDs to see if there is anything specific to it?

Jumaron•7/1/25, 5:36 PM

Sure

JJumaron hmm, I use sveltekit maybe its because of that?

lambrospetrou•7/1/25, 5:36 PM

Hmm, no idea about sveltekit.

JJumaron hmm, I use sveltekit maybe its because of that?

James•7/1/25, 9:13 PM

doubt it has anything to do w sveltekit, i use it all day, no issues

JJames doubt it has anything to do w sveltekit, i use it all day, no issues

Jumaron•7/1/25, 9:15 PM

Yes issue was resolved

Most likely the disabling and enabling the Replica button again fixed it.

Original message was deleted

lambrospetrou•7/2/25, 7:27 AM

When you don't use sessions explicitly, every request is always sent with first-primaryfirst-primary. Those examples should be identical in practice, since the replicas forward writes to the primary.

If the queries were reversed though, and the

select

select

was the 2nd query happening, they would be different.

Original message was deleted

lambrospetrou•7/2/25, 1:52 PM

Nice to hear that. Let us know if you find any issue.

Ssaminmnkani @lambrospetrou

Hello, I’m Allie!•7/2/25, 6:06 PM

?pings

SuperHelpflare•7/2/25, 6:06 PM

Please do not ping community members for non-moderation reasons. Doing so will not solve your issue faster and will make people less likely to want to help you.

onlyanegg•7/2/25, 9:58 PM

So, please forgive me if I'm asking an RTFM sort of question -- I've researched quite a bit, but haven't found definitive answers, I'd be happy to be pointed at the right place to look. I'm just getting started with CloudFlare Workers / D1, and I'm wanting to make sure I fully understand the security models so that I don't accidentally expose my users to security holes. I have read that cloudflare workers are serverless, which sounds to me like my full codebase (assembled) will be getting delivered to the end-users browser. If this is the case, it introduces some interesting security problems with disassembly, but I think is manageable. What I'm unclear about though is -- where are secrets stored, and how to prevent an end-user from doing something nefarious like modifying the wasm to query a different users data, for example. I'm sure something must be in place -- I'm guessing it's not really fully serverless, but I haven't been able to find out what portions are delivered to the end user, and which are not. Any pointers to where I can learn this would be greatly appreciated. Apologies for the novel

Oonlyanegg So, please forgive me if I'm asking an RTFM sort of question -- I've researched ...

onlyanegg•7/2/25, 10:07 PM

TLDR: workers aren't serverless in the way I was thinking of them. There isn't a single server, but edge servers all over the world that execute the code. I'm replying to myself because after I typed that novel, I thought of some new ways to search, and ended up at this link: https://www.cloudflare.com/learning/serverless/what-is-serverless/ - which explains it pretty well

Oonlyanegg TLDR: workers aren't serverless in the way I was thinking of them. There isn't ...

Chaika•7/2/25, 10:32 PM

lol yea it's kind of a confusing name for beginners, generally though when you see serverless anything it's just a way the provider is saying "You don't manage servers or server level issues/worries", generally platforms where you just worry about code, but there's still servers and datacenters behind the scenes

Isaac McFadyen•7/2/25, 11:08 PM

^ also note that there's something with a very similar name to Workers called "Service Workers" that are exactly what you described (code is delivered to browser and executed in browser), but they're something anyone can deploy/use and are different than Workers.

onlyanegg•7/2/25, 11:50 PM

Yeh thanks much for confirmation / clarification - I love the concept, am hoping to switch a fair bit of stuff off my own servers before too long

yea it does that often x) btw its fine theres no data on it yet really i can recreate it until its

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