yaegi plugins cannot implement migrations: `xorm` and `xormigrate` are not exposed in the symbol table

[npmanos]

Pre-submission checklist

• I have searched for existing open or closed issue reports with the same problem.

Description

The plugin docs (Database Migrations → "Optional Capabilities") tell plugins to implement migrations like this:

import (
	"src.techknowlogick.com/xormigrate"
	"xorm.io/xorm"
)

func (p *MyPlugin) Migrations() []*xormigrate.Migration {
	return []*xormigrate.Migration{{
		ID: "20240101000000-create-plugin-table",
		Migrate: func(tx *xorm.Engine) error { return tx.Sync2(new(PluginData)) },
	}}
}

This doesn't work under the yaegi loader. Neither xorm nor xormigrate is registered in the symbol table (pkg/yaegi_symbols/), which exposes only db, events, log, models, plugins, user, echo/v5, watermill/message. A plugin importing either fails to load at the import itself (verified against vikunja/vikunja:2.5, yaegi loader):

package main

import (
	"code.vikunja.io/api/pkg/log"
	"code.vikunja.io/api/pkg/plugins"

	"src.techknowlogick.com/xormigrate"
	"xorm.io/xorm"
)

type P struct{}

func (p *P) Name() string        { return "repro-migration" }
func (p *P) Version() string     { return "0.0.1" }
func (p *P) Init() error          { return nil }
func (p *P) Shutdown() error     { return nil }
func (p *P) Migrations() []*xormigrate.Migration {
	return []*xormigrate.Migration{{
		ID: "20260101000000-repro",
		Migrate: func(tx *xorm.Engine) error { return tx.Sync2(new(struct{ ID int64 `xorm:"pk autoincr"` })) },
	}}
}

func NewPlugin() plugins.Plugin                  { return &P{} }
func NewMigrationPlugin() plugins.MigrationPlugin { return &P{} }

level=ERROR msg="Failed to load yaegi plugin custom-fields: evaluating main.go: 7:2: import \"src.techknowlogick.com/xormigrate\" error: unable to find source related to: \"src.techknowlogick.com/xormigrate\". Either the GOPATH environment variable, or the Interpreter.Options.GoPath needs to be set"

The loader stops at the first unresolvable import (xormigrate here; xorm would fail identically). A minimal plugin using only the registered packages loads cleanly against the same instance.

The runtime wiring for plugin migrations exists and runs (MigrationPlugin, NewMigrationPlugin(), pkg/plugins/manager.go → migration.AddPluginMigrations → Migrate), but it's unreachable under yaegi because a plugin can't import the package that defines *xormigrate.Migration.

Vikunja Version

2.5.0

Browser and version

No response

Can you reproduce the bug on the Vikunja demo site?

No

Screenshots

No response

[vikunja-bot-app]

This issue has been fixed in #3549, please check with the next unstable build (should be ready for deployment in ~30min, also on the demo).