[Feature Request]: Support for multiple shells with separate stores

[Radg]

What did you expect to happen?

First of all thanks for the great tool!

I'd like to use atuin in fish and zsh with different sync accounts. I've prepared two sets of configs:

1. ~/.config/atuin/config.toml for fish with default values of db_path, key_path and session_path
2. ~/.config/atuin-zsh/config.toml for zsh with custom values:

cat ~/.config/atuin-zsh/config.toml | grep -E 'db_path|key_path|session_path'
db_path = "$HOME/.local/share/atuin-zsh/history.db"
key_path = "$HOME/.local/share/atuin-zsh/key"
session_path = "$HOME/.local/share/atuin-zsh/session

Also I set

echo $ATUIN_CONFIG_DIR
/Users/user/.config/atuin-zsh

for zsh shell

I've registered/logged into my self-hosted atuin server in each of shells w/o any issues and imported history. I am expecting, that I'll have two separate stores with separate histories

What happened?

But it looks like that atuin uses first (fish) shell's atuin store, I see it by identical number of history records:

fish

atuin info
Config files:
client config: "/Users/user/.config/atuin/config.toml"
server config: "/Users/user/.config/atuin/server.toml"
client db path: "/Users/user/.local/share/atuin/history.db"
key path: "/Users/user/.local/share/atuin/key"
session path: "/Users/user/.local/share/atuin/session"

Env Vars:
ATUIN_CONFIG_DIR = "None"

Version info:
version: 18.4.0

echo $SHELL && atuin store status | grep idx
/usr/local/bin/fish
		idx: 11210
		idx: 785
		
eza -la ~/.local/share/atuin/
.rw------- 6.6M user 11 Jan 00:56 history.db
.rw------- 4.6M user 11 Jan 00:56 history.db-wal
.rw-------   32 user 11 Jan 00:07 host_id
.rw-------   72 user 11 Jan 00:11 key
.rw-------   27 user 11 Jan 00:40 last_sync_time
.rw-------   27 user 11 Jan 00:10 last_version_check_time
.rw-------    6 user 11 Jan 00:10 latest_version
.rw-------  11M user 11 Jan 00:56 records.db
.rw-------  33k user 11 Jan 00:56 records.db-shm
.rw------- 4.3M user 11 Jan 00:56 records.db-wal
.rw-------   32 user 11 Jan 00:14 session

zsh

atuin info
Config files:
client config: "/Users/user/.config/atuin/config.toml"
server config: "/Users/user/.config/atuin/server.toml"
client db path: "/Users/user/.local/share/atuin-zsh/history.db"
key path: "/Users/user/.local/share/atuin-zsh/key"
session path: "/Users/user/.local/share/atuin-zsh/session"

Env Vars:
ATUIN_CONFIG_DIR = "/Users/user/.config/atuin-zsh"

Version info:
version: 18.4.0

echo $SHELL && atuin store status | grep idx
/bin/zsh
		idx: 784
		idx: 11210
		
eza -la ~/.local/share/atuin-zsh
.rw-------  12k user 11 Jan 00:44 history.db
.rw-------  33k user 11 Jan 00:56 history.db-shm
.rw------- 622k user 11 Jan 00:56 history.db-wal
.rw-------   72 user 11 Jan 00:19 key

At the same time atuin didn't "mix" histories between shells, I believe due to different keys used.

Thanks!

Atuin doctor output

atuin doctor
Atuin Doctor
Checking for diagnostics


Please include the output below with any bug reports or issues

{
  "atuin": {
    "version": "18.4.0",
    "sync": {
      "cloud": false,
      "records": true,
      "auto_sync": true,
      "last_sync": "2025-01-10 21:40:29.333041 +00:00:00"
    },
    "sqlite_version": "3.46.0"
  },
  "shell": {
    "name": "fish",
    "default": "fish",
    "plugins": [
      "atuin"
    ],
    "preexec": "built-in"
  },
  "system": {
    "os": "Darwin",
    "arch": "x86_64",
    "version": "15.2",
    "disks": [
      {
        "name": "MacDrive",
        "filesystem": "apfs"
      },
      {
        "name": "MacDrive",
        "filesystem": "apfs"
      }
    ]
  }
}

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