feat: replace vec0 with viant/sqlite-vec for vector search

cmd/llmem/main.go

@@ -83,12 +83,10 @@ func loadConfig() (*config.Config, error) {
 	return cfg, nil
 }
 
-// openStore creates a MemoryStore and returns it with a cleanup function.
-// Vec is disabled — use openStoreWithVec for operations that need embeddings.
+// openStore creates a MemoryStore with vector search enabled.
 func openStore() (*store.MemoryStore, error) {
 	cfg := store.StoreConfig{
-		DBPath:     resolveDBPath(),
-		DisableVec: true,
+		DBPath: resolveDBPath(),
 	}
 	ms, err := store.NewMemoryStore(cfg)
 	if err != nil {
@@ -97,19 +95,6 @@ func openStore() (*store.MemoryStore, error) {
 	return ms, nil
 }
 
-// openStoreWithVec creates a MemoryStore with vec0 enabled for embedding operations.
-func openStoreWithVec() (*store.MemoryStore, error) {
-	cfg := store.StoreConfig{
-		DBPath:     resolveDBPath(),
-		DisableVec: false,
-	}
-	ms, err := store.NewMemoryStore(cfg)
-	if err != nil {
-		return nil, fmt.Errorf("llmem: failed to initialize store with vec: %w", err)
-	}
-	return ms, nil
-}
-
 // openAdapter creates an OpenCodeAdapter from configuration.
 // If the OpenCode DB path is empty or the DB cannot be opened, returns nil
 // (the coordinator gracefully handles a nil adapter by returning no_transcript).
@@ -1208,7 +1193,7 @@ func backfillEmbeddingsCmd() *cobra.Command {
 		Use:   "backfill-embeddings",
 		Short: "Generate embeddings for memories that lack them",
 		RunE: func(cmd *cobra.Command, args []string) error {
-			ms, err := openStoreWithVec()
+			ms, err := openStore()
 			if err != nil {
 				return err
 			}

go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/hashicorp/golang-lru/v2 v2.0.7
 	github.com/pressly/goose/v3 v3.27.1
 	github.com/spf13/cobra v1.10.2
+	github.com/viant/sqlite-vec v0.3.0
 	gopkg.in/yaml.v3 v3.0.1
 	modernc.org/sqlite v1.50.0
 )
@@ -20,6 +21,7 @@ require (
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/sethvargo/go-retry v0.3.0 // indirect
 	github.com/spf13/pflag v1.0.9 // indirect
+	github.com/viant/vec v0.2.3 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/sync v0.20.0 // indirect
 	golang.org/x/sys v0.43.0 // indirect

go.sum

@@ -32,6 +32,10 @@ github.com/spf13/pflag v1.0.9 h1:9exaQaMOCwffKiiiYk6/BndUBv+iRViNW+4lEMi0PvY=
 github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+github.com/viant/sqlite-vec v0.3.0 h1:D0wCrkJ0KsO3sanmHV/m+58UwCZMFxU0wcK8LsYk00o=
+github.com/viant/sqlite-vec v0.3.0/go.mod h1:SA89LGdU/cxpc/gsvat2MYtJYrv3bg9mtW/uHMs2nBs=
+github.com/viant/vec v0.2.3 h1:NMWW1WtBXJ3Q47LHMGrXZAb6pVL3MjJfWVcEMD8V2t8=
+github.com/viant/vec v0.2.3/go.mod h1:d1coA6/d5WBePJe0nDhgE7aRYkMd7CMiRWSNid3tvds=
 go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
 go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
 go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=

internal/store/helpers.go

@@ -13,7 +13,6 @@ import (
 var (
 	reNonWord       = regexp.MustCompile(`[^\w]+`)
 	reValidTypeName = regexp.MustCompile(`^[a-z][a-z0-9_]*$`)
-	reVecDimensions = regexp.MustCompile(`float\[(\d+)\]`)
 )
 
 // nowUTC returns the current UTC time formatted as ISO 8601 (RFC 3339).

internal/store/models.go

@@ -1,5 +1,5 @@
 // Package store provides a SQLite-backed memory store with FTS5 full-text
-// search and optional vec0 vector search for the LLMem project.
+// search and vector search via sqlite-vec for the LLMem project.
 package store
 
 // Memory represents a single memory record in the store.
@@ -167,11 +167,11 @@ type StoreConfig struct {
 	// If empty, defaults to ~/.config/llmem/memory.db.
 	DBPath string
 
-	// VecDimensions is the dimensionality for the vec0 embedding index.
+	// VecDimensions is the dimensionality for the embedding index.
 	// Defaults to 768 if zero. Must be positive.
 	VecDimensions int
 
-	// DisableVec skips vec0 virtual table creation and vector search.
+	// DisableVec skips vec virtual table creation and vector search.
 	DisableVec bool
 
 	// RegisteredTypes lists the memory types to register at construction.