diff --git a/app/mf/mention.go b/app/mf/mention.go
index 551cd95..5c3080e 100644
--- a/app/mf/mention.go
+++ b/app/mf/mention.go
@@ -24,10 +24,13 @@ func (wm Mention) String() string {
 	return fmt.Sprintf("source: %s, target: %s", wm.Source, wm.Target)
 }
 
-func (wm Mention) AsPath(conf *common.Config) string {
-	filename := fmt.Sprintf("%x", md5.Sum([]byte("source="+wm.Source+",target="+wm.Target)))
+func (wm Mention) Domain(conf *common.Config) string {
 	domain, _ := conf.FetchDomain(wm.Target)
-	return conf.DataPath + "/" + domain + "/" + filename + ".json"
+	return domain
+}
+
+func (wm Mention) Key() string {
+	return fmt.Sprintf("%x", md5.Sum([]byte("source="+wm.Source+",target="+wm.Target)))
 }
 
 func (wm Mention) SourceUrl() *url.URL {
diff --git a/app/mf/microformats.go b/app/mf/microformats.go
index 5e219d6..60794b3 100644
--- a/app/mf/microformats.go
+++ b/app/mf/microformats.go
@@ -23,7 +23,7 @@ type IndiewebDataResult struct {
 	Data   []*IndiewebData `json:"json"`
 }
 
-func WrapResult(data []*IndiewebData) IndiewebDataResult {
+func ResultSuccess(data []*IndiewebData) IndiewebDataResult {
 	return IndiewebDataResult{
 		Status: "success",
 		Data:   data,
diff --git a/app/pingback/handler.go b/app/pingback/handler.go
index e81aee7..7ee7749 100644
--- a/app/pingback/handler.go
+++ b/app/pingback/handler.go
@@ -4,6 +4,7 @@ import (
 	"brainbaking.com/go-jamming/app/mf"
 	"brainbaking.com/go-jamming/app/webmention/recv"
 	"brainbaking.com/go-jamming/common"
+	"brainbaking.com/go-jamming/db"
 	"brainbaking.com/go-jamming/rest"
 	"encoding/xml"
 	"fmt"
@@ -12,7 +13,7 @@ import (
 	"net/http"
 )
 
-func HandlePost(conf *common.Config) http.HandlerFunc {
+func HandlePost(conf *common.Config, db db.MentionRepo) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		body, err := ioutil.ReadAll(r.Body)
 		if err != nil {
@@ -38,6 +39,7 @@ func HandlePost(conf *common.Config) http.HandlerFunc {
 		receiver := &recv.Receiver{
 			RestClient: &rest.HttpClient{},
 			Conf:       conf,
+			Repo:       db,
 		}
 		go receiver.Receive(wm)
 		pingbackSuccess(w)
diff --git a/app/routes.go b/app/routes.go
index 3a78358..eab0112 100644
--- a/app/routes.go
+++ b/app/routes.go
@@ -10,11 +10,12 @@ import (
 // not that contempt with passing conf, but can't create receivers on non-local types, and won't move specifics into package app
 // https://blog.questionable.services/article/http-handler-error-handling-revisited/ is the better idea, but more work
 func (s *server) routes() {
-	cnf := s.conf
+	c := s.conf
+	db := s.repo
 
-	s.router.HandleFunc("/", index.Handle(cnf)).Methods("GET")
-	s.router.HandleFunc("/pingback", pingback.HandlePost(cnf)).Methods("POST")
-	s.router.HandleFunc("/webmention", webmention.HandlePost(cnf)).Methods("POST")
-	s.router.HandleFunc("/webmention/{domain}/{token}", s.authorizedOnly(webmention.HandleGet(cnf))).Methods("GET")
-	s.router.HandleFunc("/webmention/{domain}/{token}", s.authorizedOnly(webmention.HandlePut(cnf))).Methods("PUT")
+	s.router.HandleFunc("/", index.Handle(c)).Methods("GET")
+	s.router.HandleFunc("/pingback", pingback.HandlePost(c, db)).Methods("POST")
+	s.router.HandleFunc("/webmention", webmention.HandlePost(c, db)).Methods("POST")
+	s.router.HandleFunc("/webmention/{domain}/{token}", s.authorizedOnly(webmention.HandleGet(db))).Methods("GET")
+	s.router.HandleFunc("/webmention/{domain}/{token}", s.authorizedOnly(webmention.HandlePut(c, db))).Methods("PUT")
 }
diff --git a/app/server.go b/app/server.go
index 537acef..f68cf9c 100644
--- a/app/server.go
+++ b/app/server.go
@@ -1,6 +1,7 @@
 package app
 
 import (
+	"brainbaking.com/go-jamming/db"
 	"brainbaking.com/go-jamming/rest"
 	"github.com/MagnusFrater/helmet"
 	"net/http"
@@ -16,6 +17,7 @@ import (
 type server struct {
 	router *mux.Router
 	conf   *common.Config
+	repo   db.MentionRepo
 }
 
 func (s *server) authorizedOnly(h http.HandlerFunc) http.HandlerFunc {
@@ -44,9 +46,10 @@ func ipFrom(r *http.Request) string {
 func Start() {
 	r := mux.NewRouter()
 	config := common.Configure()
+	repo := db.NewMentionRepo(config)
 	helmet := helmet.Default()
 
-	server := &server{router: r, conf: config}
+	server := &server{router: r, conf: config, repo: repo}
 
 	server.routes()
 	http.Handle("/", r)
diff --git a/app/webmention/handler.go b/app/webmention/handler.go
index 70b089f..305688d 100644
--- a/app/webmention/handler.go
+++ b/app/webmention/handler.go
@@ -2,9 +2,9 @@ package webmention
 
 import (
 	"brainbaking.com/go-jamming/app/mf"
-	"brainbaking.com/go-jamming/app/webmention/load"
 	"brainbaking.com/go-jamming/app/webmention/recv"
 	"brainbaking.com/go-jamming/app/webmention/send"
+	"brainbaking.com/go-jamming/db"
 	"github.com/gorilla/mux"
 	"net/http"
 
@@ -16,18 +16,14 @@ var (
 	httpClient = &rest.HttpClient{}
 )
 
-func HandleGet(conf *common.Config) http.HandlerFunc {
+func HandleGet(repo db.MentionRepo) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		domain := mux.Vars(r)["domain"]
-		conf.Lock(domain)
-		defer conf.Unlock(domain)
-		result := load.FromDisk(domain, conf.DataPath)
-
-		rest.Json(w, result)
+		rest.Json(w, repo.GetAll(domain))
 	}
 }
 
-func HandlePut(conf *common.Config) http.HandlerFunc {
+func HandlePut(conf *common.Config, repo db.MentionRepo) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		since := getSinceQueryParam(r)
 		domain := mux.Vars(r)["domain"]
@@ -35,6 +31,7 @@ func HandlePut(conf *common.Config) http.HandlerFunc {
 		snder := &send.Sender{
 			RestClient: httpClient,
 			Conf:       conf,
+			Repo:       repo,
 		}
 		go snder.Send(domain, since)
 		rest.Accept(w)
@@ -50,7 +47,7 @@ func getSinceQueryParam(r *http.Request) string {
 	return since
 }
 
-func HandlePost(conf *common.Config) http.HandlerFunc {
+func HandlePost(conf *common.Config, repo db.MentionRepo) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		r.ParseForm()
 		if !validate(r, r.Header, conf) {
@@ -71,6 +68,7 @@ func HandlePost(conf *common.Config) http.HandlerFunc {
 		recv := &recv.Receiver{
 			RestClient: httpClient,
 			Conf:       conf,
+			Repo:       repo,
 		}
 
 		go recv.Receive(wm)
diff --git a/app/webmention/load/loader.go b/app/webmention/load/loader.go
deleted file mode 100644
index b1549f0..0000000
--- a/app/webmention/load/loader.go
+++ /dev/null
@@ -1,39 +0,0 @@
-package load
-
-import (
-	"brainbaking.com/go-jamming/app/mf"
-	"io/ioutil"
-	"path"
-)
-
-// FromDisk assumes that params have already been validated.
-func FromDisk(domain string, dataPath string) mf.IndiewebDataResult {
-	loadPath := path.Join(dataPath, domain)
-	info, _ := ioutil.ReadDir(loadPath)
-	amountOfFiles := len(info)
-
-	sema := make(chan struct{}, 20)
-	results := make(chan *mf.IndiewebData, amountOfFiles)
-
-	for _, file := range info {
-		go func(fileName string) {
-			sema <- struct{}{}
-			defer func() { <-sema }()
-			results <- mf.RequireFromFile(path.Join(loadPath, fileName))
-		}(file.Name())
-	}
-
-	indiewebResults := gather(amountOfFiles, results)
-	return mf.WrapResult(indiewebResults)
-}
-
-func gather(amount int, results <-chan *mf.IndiewebData) []*mf.IndiewebData {
-	var indiewebResults []*mf.IndiewebData
-	for i := 0; i < amount; i++ {
-		result := <-results
-		if !result.IsEmpty() {
-			indiewebResults = append(indiewebResults, result)
-		}
-	}
-	return indiewebResults
-}
diff --git a/app/webmention/load/loader_test.go b/app/webmention/load/loader_test.go
deleted file mode 100644
index 2ffe846..0000000
--- a/app/webmention/load/loader_test.go
+++ /dev/null
@@ -1,69 +0,0 @@
-package load
-
-import (
-	"fmt"
-	"github.com/stretchr/testify/assert"
-	"io/ioutil"
-	"os"
-	"sort"
-	"strings"
-	"testing"
-)
-
-// stress tests to see what concurrent disk access is like. Runs fine, even with 5000 runs and 100 files.
-// this means worker pools do not have to be implemented in FromDisk().
-// However, if runs := 10000, some results are empty. At other times, even ioutil.ReadDir() panics...
-// The rate limiter should catch this, combined with a domain read lock in the caller.
-// Furthermore, a run of 1 and files of 50k breaks the OS without using a semaphore to limit the nr. of open files!
-func TestFromDiskStressTest(t *testing.T) {
-	runs := 100
-	files := 100
-
-	os.MkdirAll("testdata/somedomain", os.ModePerm)
-	defer os.RemoveAll("testdata")
-
-	for i := 0; i < files; i++ {
-		json := `{"author":{"name":"Jef Klakveld","picture":"https://brainbaking.com/img/avatar.jpg"},"name":"I much prefer Sonic Mania's Lock On to Belgium's t...","content":"I much prefer Sonic Mania’s Lock On to Belgium’s third Lock Down. Sigh. At least 16-bit 2D platformers make me smile: https://jefklakscodex.com/articles/reviews/sonic-mania/\n\n\n\nEnclosed Toot image","published":"2021-03-25T10:45:00","url":"https://brainbaking.com/notes/2021/03/25h10m45s09/","type":"mention","source":"https://brainbaking.com/notes/2021/03/25h10m45s09/","target":"https://jefklakscodex.com/articles/reviews/sonic-mania/"}`
-		ioutil.WriteFile(fmt.Sprintf("testdata/somedomain/%d.json", i), []byte(json), os.ModePerm)
-	}
-
-	amounts := make(chan int, runs)
-	for i := 0; i < runs; i++ {
-		go func(nr int) {
-			data := FromDisk("somedomain", "testdata")
-			itms := len(data.Data)
-
-			fmt.Printf("From disk #%d - found %d items\n", nr, itms)
-			amounts <- itms
-		}(i)
-	}
-
-	fmt.Println("Asserting...")
-	for i := 0; i < runs; i++ {
-		actual := <-amounts
-		assert.Equal(t, files, actual)
-	}
-}
-
-func TestFromDiskReturnsAllJsonFilesFromDiskWrappedInResult(t *testing.T) {
-	os.MkdirAll("testdata/somedomain", os.ModePerm)
-	defer os.RemoveAll("testdata")
-
-	json1 := `{"author":{"name":"Wouter Groeneveld","picture":"https://brainbaking.com/img/avatar.jpg"},"name":"I much prefer Sonic Mania's Lock On to Belgium's t...","content":"I much prefer Sonic Mania’s Lock On to Belgium’s third Lock Down. Sigh. At least 16-bit 2D platformers make me smile: https://jefklakscodex.com/articles/reviews/sonic-mania/\n\n\n\nEnclosed Toot image","published":"2021-03-25T10:45:00","url":"https://brainbaking.com/notes/2021/03/25h10m45s09/","type":"mention","source":"https://brainbaking.com/notes/2021/03/25h10m45s09/","target":"https://jefklakscodex.com/articles/reviews/sonic-mania/"}`
-	json2 := `{"author":{"name":"Jef Klakveld","picture":"https://brainbaking.com/img/avatar.jpg"},"name":"I much prefer Sonic Mania's Lock On to Belgium's t...","content":"I much prefer Sonic Mania’s Lock On to Belgium’s third Lock Down. Sigh. At least 16-bit 2D platformers make me smile: https://jefklakscodex.com/articles/reviews/sonic-mania/\n\n\n\nEnclosed Toot image","published":"2021-03-25T10:45:00","url":"https://brainbaking.com/notes/2021/03/25h10m45s09/","type":"mention","source":"https://brainbaking.com/notes/2021/03/25h10m45s09/","target":"https://jefklakscodex.com/articles/reviews/sonic-mania/"}`
-	ioutil.WriteFile("testdata/somedomain/testjson1.json", []byte(json1), os.ModePerm)
-	ioutil.WriteFile("testdata/somedomain/testjson2.json", []byte(json2), os.ModePerm)
-
-	result := FromDisk("somedomain", "testdata")
-	sort.SliceStable(result.Data, func(i, j int) bool {
-		comp := strings.Compare(result.Data[i].Author.Name, result.Data[j].Author.Name)
-		if comp > 0 {
-			return false
-		}
-		return true
-	})
-
-	assert.Equal(t, "success", result.Status)
-	assert.Equal(t, "Jef Klakveld", result.Data[0].Author.Name)
-	assert.Equal(t, "Wouter Groeneveld", result.Data[1].Author.Name)
-}
diff --git a/app/webmention/recv/receive.go b/app/webmention/recv/receive.go
index c8f4a50..77f182f 100644
--- a/app/webmention/recv/receive.go
+++ b/app/webmention/recv/receive.go
@@ -3,11 +3,8 @@ package recv
 import (
 	"brainbaking.com/go-jamming/app/mf"
 	"brainbaking.com/go-jamming/common"
+	"brainbaking.com/go-jamming/db"
 	"brainbaking.com/go-jamming/rest"
-	"encoding/json"
-	"io/fs"
-	"io/ioutil"
-	"os"
 	"regexp"
 	"strings"
 
@@ -20,6 +17,7 @@ import (
 type Receiver struct {
 	RestClient rest.Client
 	Conf       *common.Config
+	Repo       db.MentionRepo
 }
 
 func (recv *Receiver) Receive(wm mf.Mention) {
@@ -28,18 +26,13 @@ func (recv *Receiver) Receive(wm mf.Mention) {
 
 	if geterr != nil {
 		log.Warn().Err(geterr).Msg("  ABORT: invalid url")
-		recv.deletePossibleOlderWebmention(wm)
+		recv.Repo.Delete(wm)
 		return
 	}
 
 	recv.processSourceBody(body, wm)
 }
 
-// Deletes a possible webmention. Ignores remove errors.
-func (recv *Receiver) deletePossibleOlderWebmention(wm mf.Mention) {
-	os.Remove(wm.AsPath(recv.Conf))
-}
-
 func (recv *Receiver) processSourceBody(body string, wm mf.Mention) {
 	if !strings.Contains(body, wm.Target) {
 		log.Warn().Str("target", wm.Target).Msg("ABORT: no mention of target found in html src of source!")
@@ -49,10 +42,11 @@ func (recv *Receiver) processSourceBody(body string, wm mf.Mention) {
 	data := microformats.Parse(strings.NewReader(body), wm.SourceUrl())
 	indieweb := recv.convertBodyToIndiewebData(body, wm, mf.HEntry(data))
 
-	if err := recv.saveWebmentionToDisk(wm, indieweb); err != nil {
-		log.Err(err).Msg("Unable to save Webmention to disk")
+	key, err := recv.Repo.Save(wm, indieweb)
+	if err != nil {
+		log.Error().Err(err).Stringer("wm", wm).Msg("processSourceBody: failed to save json to db")
 	}
-	log.Info().Str("file", wm.AsPath(recv.Conf)).Msg("OK: Webmention processed.")
+	log.Info().Str("key", key).Msg("OK: Webmention processed.")
 }
 
 func (recv *Receiver) convertBodyToIndiewebData(body string, wm mf.Mention, hEntry *microformats.Microformat) *mf.IndiewebData {
@@ -62,21 +56,6 @@ func (recv *Receiver) convertBodyToIndiewebData(body string, wm mf.Mention, hEnt
 	return recv.parseBodyAsIndiewebSite(hEntry, wm)
 }
 
-func (recv *Receiver) saveWebmentionToDisk(wm mf.Mention, indieweb *mf.IndiewebData) error {
-	domain, _ := recv.Conf.FetchDomain(wm.Target)
-	recv.Conf.Lock(domain)
-	defer recv.Conf.Unlock(domain)
-	jsonData, jsonErr := json.Marshal(indieweb)
-	if jsonErr != nil {
-		return jsonErr
-	}
-	err := ioutil.WriteFile(wm.AsPath(recv.Conf), jsonData, fs.ModePerm)
-	if err != nil {
-		return err
-	}
-	return nil
-}
-
 // see https://github.com/willnorris/microformats/blob/main/microformats.go
 func (recv *Receiver) parseBodyAsIndiewebSite(hEntry *microformats.Microformat, wm mf.Mention) *mf.IndiewebData {
 	return &mf.IndiewebData{
diff --git a/app/webmention/recv/receive_test.go b/app/webmention/recv/receive_test.go
index 1b2f9a4..27e5d36 100644
--- a/app/webmention/recv/receive_test.go
+++ b/app/webmention/recv/receive_test.go
@@ -2,11 +2,11 @@ package recv
 
 import (
 	"brainbaking.com/go-jamming/app/mf"
+	"brainbaking.com/go-jamming/db"
+	"encoding/json"
 	"errors"
 	"github.com/stretchr/testify/assert"
-	"io/ioutil"
 	"net/http"
-	"os"
 	"testing"
 	"time"
 
@@ -19,25 +19,7 @@ var conf = &common.Config{
 		"jefklakscodex.com",
 		"brainbaking.com",
 	},
-	DataPath: "testdata",
-}
-
-func TestConvertWebmentionToPath(t *testing.T) {
-	wm := mf.Mention{
-		Source: "https://brainbaking.com",
-		Target: "https://jefklakscodex.com/articles",
-	}
-
-	result := wm.AsPath(conf)
-	if result != "testdata/jefklakscodex.com/99be66594fdfcf482545fead8e7e4948.json" {
-		t.Fatalf("md5 hash check failed, got " + result)
-	}
-}
-
-func writeSomethingTo(filename string) {
-	file, _ := os.Create(filename)
-	file.WriteString("lolz")
-	defer file.Close()
+	Connection: ":memory:",
 }
 
 func TestReceive(t *testing.T) {
@@ -100,15 +82,14 @@ func TestReceive(t *testing.T) {
 
 	for _, tc := range cases {
 		t.Run(tc.label, func(t *testing.T) {
-			os.MkdirAll("testdata/brainbaking.com", os.ModePerm)
-			os.MkdirAll("testdata/jefklakscodex.com", os.ModePerm)
-			defer os.RemoveAll("testdata")
 			common.Now = func() time.Time {
 				return time.Date(2020, time.January, 1, 12, 30, 0, 0, time.UTC)
 			}
 
+			repo := db.NewMentionRepo(conf)
 			receiver := &Receiver{
-				Conf: common.NewConfig(conf),
+				Conf: conf,
+				Repo: repo,
 				RestClient: &mocks.RestClientMock{
 					GetBodyFunc: mocks.RelPathGetBodyFunc(t, "../../../mocks/"),
 				},
@@ -116,22 +97,23 @@ func TestReceive(t *testing.T) {
 
 			receiver.Receive(tc.wm)
 
-			actualJson, _ := ioutil.ReadFile(tc.wm.AsPath(conf))
+			actual := repo.Get(tc.wm)
+			actualJson, _ := json.Marshal(actual)
 			assert.JSONEq(t, tc.json, string(actualJson))
 		})
 	}
 }
 
 func TestReceiveTargetDoesNotExistAnymoreDeletesPossiblyOlderWebmention(t *testing.T) {
-	os.MkdirAll("testdata/jefklakscodex.com", os.ModePerm)
-	defer os.RemoveAll("testdata")
+	repo := db.NewMentionRepo(conf)
 
 	wm := mf.Mention{
 		Source: "https://brainbaking.com",
 		Target: "https://jefklakscodex.com/articles",
 	}
-	filename := wm.AsPath(conf)
-	writeSomethingTo(filename)
+	repo.Save(wm, &mf.IndiewebData{
+		Name: "something something",
+	})
 
 	client := &mocks.RestClientMock{
 		GetBodyFunc: func(url string) (http.Header, string, error) {
@@ -139,12 +121,14 @@ func TestReceiveTargetDoesNotExistAnymoreDeletesPossiblyOlderWebmention(t *testi
 		},
 	}
 	receiver := &Receiver{
-		Conf:       common.NewConfig(conf),
+		Conf:       conf,
 		RestClient: client,
+		Repo:       repo,
 	}
 
 	receiver.Receive(wm)
-	assert.NoFileExists(t, filename)
+	indb := repo.Get(wm)
+	assert.Empty(t, indb)
 }
 
 func TestReceiveTargetThatDoesNotPointToTheSourceDoesNothing(t *testing.T) {
@@ -152,32 +136,31 @@ func TestReceiveTargetThatDoesNotPointToTheSourceDoesNothing(t *testing.T) {
 		Source: "https://brainbaking.com/valid-indieweb-source.html",
 		Target: "https://brainbaking.com/valid-indieweb-source.html",
 	}
-	filename := wm.AsPath(conf)
-	writeSomethingTo(filename)
 
+	repo := db.NewMentionRepo(conf)
 	receiver := &Receiver{
-		Conf: common.NewConfig(conf),
+		Conf: conf,
+		Repo: repo,
 		RestClient: &mocks.RestClientMock{
 			GetBodyFunc: mocks.RelPathGetBodyFunc(t, "../../../mocks/"),
 		},
 	}
 
 	receiver.Receive(wm)
-	assert.NoFileExists(t, filename)
+	assert.Empty(t, repo.GetAll("brainbaking.com").Data)
 }
 
 func TestProcessSourceBodyAbortsIfNoMentionOfTargetFoundInSourceHtml(t *testing.T) {
-	os.MkdirAll("testdata/jefklakscodex.com", os.ModePerm)
-	defer os.RemoveAll("testdata")
-
 	wm := mf.Mention{
 		Source: "https://brainbaking.com",
 		Target: "https://jefklakscodex.com/articles",
 	}
+	repo := db.NewMentionRepo(conf)
 	receiver := &Receiver{
-		Conf: common.NewConfig(conf),
+		Conf: conf,
+		Repo: repo,
 	}
 
 	receiver.processSourceBody("<html>my nice body</html>", wm)
-	assert.NoFileExists(t, wm.AsPath(conf))
+	assert.Empty(t, repo.Get(wm))
 }
diff --git a/app/webmention/send/send.go b/app/webmention/send/send.go
index e156379..e98bf50 100644
--- a/app/webmention/send/send.go
+++ b/app/webmention/send/send.go
@@ -4,11 +4,9 @@ import (
 	"brainbaking.com/go-jamming/app/mf"
 	"brainbaking.com/go-jamming/app/pingback/send"
 	"brainbaking.com/go-jamming/common"
+	"brainbaking.com/go-jamming/db"
 	"brainbaking.com/go-jamming/rest"
-	"fmt"
 	"github.com/rs/zerolog/log"
-	"io/fs"
-	"io/ioutil"
 	"strings"
 	"sync"
 	"time"
@@ -17,27 +15,27 @@ import (
 type Sender struct {
 	RestClient rest.Client
 	Conf       *common.Config
+	Repo       db.MentionRepo
 }
 
 func (snder *Sender) sinceForDomain(domain string, since string) time.Time {
 	if since != "" {
 		return common.IsoToTime(since)
 	}
-	sinceConf, err := ioutil.ReadFile(fmt.Sprintf("%s/%s-since.txt", snder.Conf.DataPath, domain))
+
+	sinceConf, err := snder.Repo.Since(domain)
 	if err != nil {
-		log.Warn().Str("since", since).Msg("No query param, and no config found. Reverting to beginning of time...")
+		log.Warn().Str("domain", domain).Msg("No query param, and no config found. Reverting to beginning of time...")
 		return time.Time{}
 	}
-	return common.IsoToTime(string(sinceConf))
+	return sinceConf
 }
 
-func (snder *Sender) saveSinceForDomain(domain string, since time.Time) {
-	ioutil.WriteFile(fmt.Sprintf("%s/%s-since.txt", snder.Conf.DataPath, domain), []byte(common.TimeToIso(since)), fs.ModePerm)
+func (snder *Sender) updateSinceForDomain(domain string) {
+	snder.Repo.UpdateSince(domain, common.Now())
 }
 
 func (snder *Sender) Send(domain string, since string) {
-	snder.Conf.Lock(domain)
-	defer snder.Conf.Unlock(domain)
 	timeSince := snder.sinceForDomain(domain, since)
 	log.Info().Str("domain", domain).Time("since", timeSince).Msg(` OK: someone wants to send mentions`)
 	feedUrl := "https://" + domain + "/index.xml"
@@ -52,7 +50,7 @@ func (snder *Sender) Send(domain string, since string) {
 		return
 	}
 
-	snder.saveSinceForDomain(domain, timeSince)
+	snder.updateSinceForDomain(domain)
 }
 
 func (snder *Sender) parseRssFeed(feed string, since time.Time) error {
diff --git a/app/webmention/send/send_test.go b/app/webmention/send/send_test.go
index 9655613..186c90c 100644
--- a/app/webmention/send/send_test.go
+++ b/app/webmention/send/send_test.go
@@ -3,24 +3,30 @@ package send
 import (
 	"brainbaking.com/go-jamming/app/mf"
 	"brainbaking.com/go-jamming/common"
+	"brainbaking.com/go-jamming/db"
 	"brainbaking.com/go-jamming/mocks"
 	"brainbaking.com/go-jamming/rest"
 	"fmt"
 	"github.com/stretchr/testify/assert"
-	"io/ioutil"
 	"net/http"
 	"net/url"
-	"os"
 	"sync"
 	"testing"
 	"time"
 )
 
+var conf = &common.Config{
+	Connection: ":memory:",
+	AllowedWebmentionSources: []string{
+		"domain",
+	},
+}
+
 func TestSinceForDomain(t *testing.T) {
 	cases := []struct {
 		label        string
 		sinceInParam string
-		sinceInFile  string
+		sinceInDb    string
 		expected     time.Time
 	}{
 		{
@@ -43,19 +49,14 @@ func TestSinceForDomain(t *testing.T) {
 		},
 	}
 
-	snder := Sender{
-		Conf: &common.Config{
-			DataPath: "testdata",
-		},
-	}
-
 	for _, tc := range cases {
 		t.Run(tc.label, func(t *testing.T) {
-			os.MkdirAll("testdata", os.ModePerm)
-			defer os.RemoveAll("testdata")
-
-			if tc.sinceInFile != "" {
-				ioutil.WriteFile("testdata/domain-since.txt", []byte(tc.sinceInFile), os.ModePerm)
+			snder := Sender{
+				Conf: conf,
+				Repo: db.NewMentionRepo(conf),
+			}
+			if tc.sinceInDb != "" {
+				snder.Repo.UpdateSince("domain", common.IsoToTime(tc.sinceInDb))
 			}
 
 			actual := snder.sinceForDomain("domain", tc.sinceInParam)
@@ -95,10 +96,9 @@ func TestSendMentionAsWebmention(t *testing.T) {
 // The rate limiter fixes this, and in reality, we never send out 10k links anyway.
 func TestSendMentionIntegrationStressTest(t *testing.T) {
 	snder := Sender{
-		Conf:       common.Configure(),
+		Conf:       conf,
 		RestClient: &rest.HttpClient{},
 	}
-	defer os.RemoveAll("data")
 
 	runs := 100
 	responses := make(chan bool, runs)
@@ -143,10 +143,10 @@ func TestSendMentionIntegrationStressTest(t *testing.T) {
 func TestSendIntegrationTestCanSendBothWebmentionsAndPingbacks(t *testing.T) {
 	posted := map[string]interface{}{}
 	var lock = sync.Mutex{}
-	defer os.RemoveAll("data")
 
 	snder := Sender{
-		Conf: common.Configure(),
+		Conf: conf,
+		Repo: db.NewMentionRepo(conf),
 		RestClient: &mocks.RestClientMock{
 			GetBodyFunc: mocks.RelPathGetBodyFunc(t, "./../../../mocks/"),
 			PostFunc: func(url string, contentType string, body string) error {
diff --git a/common/config.go b/common/config.go
index f01ed88..98de6ae 100644
--- a/common/config.go
+++ b/common/config.go
@@ -3,12 +3,9 @@ package common
 import (
 	"encoding/json"
 	"errors"
-	"io/ioutil"
-	"os"
-	"strings"
-	"sync"
-
 	"github.com/rs/zerolog/log"
+	"io/ioutil"
+	"strings"
 )
 
 type Config struct {
@@ -16,23 +13,9 @@ type Config struct {
 	Token                       string   `json:"token"`
 	UtcOffset                   int      `json:"utcOffset"`
 	DataPath                    string   `json:"dataPath"`
+	Connection                  string   `json:"conString"`
 	AllowedWebmentionSources    []string `json:"allowedWebmentionSources"`
 	DisallowedWebmentionDomains []string `json:"disallowedWebmentionDomains"`
-
-	domainLocks map[string]*sync.RWMutex
-}
-
-func (c *Config) Lock(domain string) {
-	c.domainLocks[domain].Lock()
-}
-func (c *Config) RLock(domain string) {
-	c.domainLocks[domain].RLock()
-}
-func (c *Config) RUnLock(domain string) {
-	c.domainLocks[domain].RUnlock()
-}
-func (c *Config) Unlock(domain string) {
-	c.domainLocks[domain].Unlock()
 }
 
 func (c *Config) missingKeys() []string {
@@ -79,34 +62,12 @@ func (c *Config) FetchDomain(url string) (string, error) {
 	return "", errors.New("no allowed domain found for url " + url)
 }
 
-func NewConfig(c *Config) *Config {
-	conf := &Config{
-		Port:                        c.Port,
-		Token:                       c.Token,
-		UtcOffset:                   c.UtcOffset,
-		DataPath:                    c.DataPath,
-		AllowedWebmentionSources:    c.AllowedWebmentionSources,
-		DisallowedWebmentionDomains: c.DisallowedWebmentionDomains,
-		domainLocks:                 map[string]*sync.RWMutex{},
-	}
-	initConfig(conf)
-	return conf
-}
-
 func Configure() *Config {
 	conf := config()
-	initConfig(conf)
-	return conf
-}
-
-func initConfig(conf *Config) {
-	conf.domainLocks = map[string]*sync.RWMutex{}
 	for _, domain := range conf.AllowedWebmentionSources {
-		conf.domainLocks[domain] = &sync.RWMutex{}
-		os.MkdirAll(conf.DataPath+"/"+domain, os.ModePerm)
-
 		log.Info().Str("allowedDomain", domain).Msg("Configured")
 	}
+	return conf
 }
 
 func config() *Config {
@@ -136,6 +97,7 @@ func defaultConfig() *Config {
 		Token:                       "miauwkes",
 		UtcOffset:                   60,
 		DataPath:                    "data",
+		Connection:                  "data/mentions.db",
 		AllowedWebmentionSources:    []string{"brainbaking.com", "jefklakscodex.com"},
 		DisallowedWebmentionDomains: []string{"youtube.com"},
 	}
diff --git a/db/repo.go b/db/repo.go
new file mode 100644
index 0000000..022fb19
--- /dev/null
+++ b/db/repo.go
@@ -0,0 +1,146 @@
+// A database wrapper package for BuntDB that persists indieweb (meta)data.
+// Most functions silently suppress errors as with consistent states, it would be impossible.
+package db
+
+import (
+	"brainbaking.com/go-jamming/app/mf"
+	"brainbaking.com/go-jamming/common"
+	"encoding/json"
+	"fmt"
+	"github.com/rs/zerolog/log"
+	"github.com/tidwall/buntdb"
+	"time"
+)
+
+type MentionRepoBunt struct {
+	db   *buntdb.DB
+	conf *common.Config
+}
+
+type MentionRepo interface {
+	Save(key mf.Mention, data *mf.IndiewebData) (string, error)
+	Delete(key mf.Mention)
+	Since(domain string) (time.Time, error)
+	UpdateSince(domain string, since time.Time)
+	Get(key mf.Mention) *mf.IndiewebData
+	GetAll(domain string) mf.IndiewebDataResult
+}
+
+// UpdateSince updates the since timestamp to now. Logs but ignores errors.
+func (r *MentionRepoBunt) UpdateSince(domain string, since time.Time) {
+	err := r.db.Update(func(tx *buntdb.Tx) error {
+		_, _, err := tx.Set(fmt.Sprintf("%s:since", domain), common.TimeToIso(since), nil)
+		return err
+	})
+	if err != nil {
+		log.Error().Err(err).Msg("UpdateSince: unable to save")
+	}
+}
+
+// Since fetches the last timestamp of the mf send.
+// Returns converted found instance, or an error if none found.
+func (r *MentionRepoBunt) Since(domain string) (time.Time, error) {
+	var since string
+	err := r.db.View(func(tx *buntdb.Tx) error {
+		val, err := tx.Get(fmt.Sprintf("%s:since", domain))
+		since = val
+		return err
+	})
+	if err != nil {
+		return time.Time{}, err
+	}
+	return common.IsoToTime(since), nil
+}
+
+// Delete removes a possibly present mention by key. Ignores possible errors.
+func (r *MentionRepoBunt) Delete(wm mf.Mention) {
+	key := r.mentionToKey(wm)
+	r.db.Update(func(tx *buntdb.Tx) error {
+		tx.Delete(key)
+		return nil
+	})
+}
+
+// Save saves the mention by marshalling data. Returns the key or a marshal/persist error.
+func (r *MentionRepoBunt) Save(wm mf.Mention, data *mf.IndiewebData) (string, error) {
+	jsonData, err := json.Marshal(data)
+	if err != nil {
+		return "", err
+	}
+	key := r.mentionToKey(wm)
+	err = r.db.Update(func(tx *buntdb.Tx) error {
+		_, _, err := tx.Set(key, string(jsonData), nil)
+		return err
+	})
+	if err != nil {
+		return "", err
+	}
+	return key, nil
+}
+
+func (r *MentionRepoBunt) mentionToKey(wm mf.Mention) string {
+	return fmt.Sprintf("%s:%s", wm.Key(), wm.Domain(r.conf))
+}
+
+// Get returns a single unmarshalled json value based on the mention key.
+// It returns the unmarshalled result or nil if something went wrong.
+func (r *MentionRepoBunt) Get(wm mf.Mention) *mf.IndiewebData {
+	var data mf.IndiewebData
+	key := r.mentionToKey(wm)
+	err := r.db.View(func(tx *buntdb.Tx) error {
+		val, err := tx.Get(key)
+		if err != nil {
+			return err
+		}
+		err = json.Unmarshal([]byte(val), &data)
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+	if err != nil {
+		log.Error().Err(err).Str("key", key).Msg("repo get: unable to retrieve key")
+		return nil
+	}
+	return &data
+}
+
+// GetAll returns a wrapped data result for all mentions for a particular domain.
+// Intentionally ignores marshal errors, db should be consistent!
+// Warning, this will potentially marshall 10k strings!
+func (r *MentionRepoBunt) GetAll(domain string) mf.IndiewebDataResult {
+	var data []*mf.IndiewebData
+	err := r.db.View(func(tx *buntdb.Tx) error {
+		return tx.Ascend(domain, func(key, value string) bool {
+			var result mf.IndiewebData
+			json.Unmarshal([]byte(value), &result)
+			data = append(data, &result)
+			return true
+		})
+	})
+	if err != nil {
+		log.Error().Err(err).Msg("get all: failed to ascend from view")
+		return mf.IndiewebDataResult{}
+	}
+	return mf.ResultSuccess(data)
+}
+
+// NewMentionRepo opens a database connection using default buntdb settings.
+// It also creates necessary indexes based on the passed domain config.
+// This panics if it cannot open the db.
+func NewMentionRepo(c *common.Config) *MentionRepoBunt {
+	repo := &MentionRepoBunt{
+		conf: c,
+	}
+	db, err := buntdb.Open(c.Connection)
+	if err != nil {
+		log.Fatal().Str("constr", c.Connection).Msg("new mention repo: cannot open db")
+	}
+	repo.db = db
+
+	for _, domain := range c.AllowedWebmentionSources {
+		db.CreateIndex(domain, fmt.Sprintf("*:%s", domain), buntdb.IndexString)
+	}
+
+	return repo
+}
diff --git a/db/repo_test.go b/db/repo_test.go
new file mode 100644
index 0000000..693fdfc
--- /dev/null
+++ b/db/repo_test.go
@@ -0,0 +1,128 @@
+package db
+
+import (
+	"brainbaking.com/go-jamming/app/mf"
+	"brainbaking.com/go-jamming/common"
+	"fmt"
+	"github.com/stretchr/testify/assert"
+	"github.com/tidwall/buntdb"
+	"os"
+	"testing"
+	"time"
+)
+
+var (
+	conf = &common.Config{
+		Connection: ":memory:",
+		AllowedWebmentionSources: []string{
+			"pussycat.com",
+		},
+	}
+)
+
+func TestDelete(t *testing.T) {
+	db := NewMentionRepo(conf)
+	wm := mf.Mention{
+		Target: "pussycat.com/coolpussy.html",
+	}
+	db.Save(wm, &mf.IndiewebData{
+		Name: "lolz",
+	})
+	db.Delete(wm)
+
+	results := db.GetAll("pussycat.com")
+	assert.Equal(t, 0, len(results.Data))
+}
+
+func TestUpdateSince(t *testing.T) {
+	db := NewMentionRepo(conf)
+	nowStamp := time.Date(2020, 10, 13, 14, 15, 0, 0, time.UTC)
+
+	db.UpdateSince("pussycat.com", nowStamp)
+	since, err := db.Since("pussycat.com")
+
+	assert.NoError(t, err)
+	assert.Equal(t, nowStamp, since)
+}
+
+func TestSinceFirstTimeIsEmptytime(t *testing.T) {
+	db := NewMentionRepo(conf)
+	since, err := db.Since("pussycat.com")
+
+	assert.Equal(t, buntdb.ErrNotFound, err)
+	assert.Equal(t, time.Time{}, since)
+}
+
+func TestGet(t *testing.T) {
+	db := NewMentionRepo(conf)
+	wm := mf.Mention{
+		Target: "pussycat.com/coolpussy.html",
+	}
+	db.Save(wm, &mf.IndiewebData{
+		Name: "lolz",
+	})
+
+	result := db.Get(wm)
+	assert.Equal(t, "lolz", result.Name)
+}
+
+func BenchmarkMentionRepoBunt_GetAll(b *testing.B) {
+	defer os.Remove("test.db")
+	db := NewMentionRepo(&common.Config{
+		Connection: "test.db",
+		AllowedWebmentionSources: []string{
+			"pussycat.com",
+		},
+	})
+
+	items := 10000
+	fmt.Printf(" -- Saving %d items\n", items)
+	for n := 0; n < items; n++ {
+		db.Save(mf.Mention{
+			Source: fmt.Sprintf("https://blahsource.com/%d/ding.html", n),
+			Target: fmt.Sprintf("https://pussycat.com/%d/ding.html", n),
+		}, &mf.IndiewebData{
+			Name: fmt.Sprintf("benchmark %d", n),
+			Author: mf.IndiewebAuthor{
+				Name: fmt.Sprintf("author %d", n),
+			},
+		})
+	}
+
+	b.Run(fmt.Sprintf(" -- Benchmark Get All for #%d\n", b.N), func(b *testing.B) {
+		for n := 0; n < b.N; n++ {
+			db.GetAll("pussycat.com")
+		}
+	})
+}
+
+func TestGetAllAndSaveSomeJson(t *testing.T) {
+	db := NewMentionRepo(conf)
+	db.Save(mf.Mention{
+		Target: "pussycat.com/coolpussy.html",
+	}, &mf.IndiewebData{
+		Name: "lolz",
+	})
+
+	results := db.GetAll("pussycat.com")
+	assert.Equal(t, 1, len(results.Data))
+	assert.Equal(t, "lolz", results.Data[0].Name)
+}
+
+func TestGetFiltersBasedOnDomain(t *testing.T) {
+	db := NewMentionRepo(conf)
+	db.Save(mf.Mention{
+		Target: "pussycat.com/coolpussy.html",
+	}, &mf.IndiewebData{
+		Name: "lolz",
+	})
+	db.Save(mf.Mention{
+		Target: "dingeling.com/dogshateus.html",
+	}, &mf.IndiewebData{
+		Name: "amaigat",
+	})
+
+	results := db.GetAll("pussycat.com")
+	assert.Equal(t, 1, len(results.Data))
+	assert.Equal(t, "lolz", results.Data[0].Name)
+}
diff --git a/go.mod b/go.mod
index 5215333..0dda4fc 100644
--- a/go.mod
+++ b/go.mod
@@ -9,6 +9,7 @@ require (
 	github.com/hashicorp/go-retryablehttp v0.6.8
 	github.com/rs/zerolog v1.21.0
 	github.com/stretchr/testify v1.7.0
+	github.com/tidwall/buntdb v1.2.3 // indirect
 	golang.org/x/time v0.0.0-20210220033141-f8bda1e9f3ba
 	willnorris.com/go/microformats v1.1.1
 )
diff --git a/go.sum b/go.sum
index 6b61e27..e4b1d47 100644
--- a/go.sum
+++ b/go.sum
@@ -28,6 +28,23 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/tidwall/btree v0.4.2 h1:aLwwJlG+InuFzdAPuBf9YCAR1LvSQ9zhC5aorFPlIPs=
+github.com/tidwall/btree v0.4.2/go.mod h1:huei1BkDWJ3/sLXmO+bsCNELL+Bp2Kks9OLyQFkzvA8=
+github.com/tidwall/buntdb v1.2.3 h1:AoGVe4yrhKmnEPHrPrW5EUOATHOCIk4VtFvd8xn/ZtU=
+github.com/tidwall/buntdb v1.2.3/go.mod h1:+i/gBwYOHWG19wLgwMXFLkl00twh9+VWkkaOhuNQ4PA=
+github.com/tidwall/gjson v1.7.4 h1:19cchw8FOxkG5mdLRkGf9jqIqEyqdZhPqW60XfyFxk8=
+github.com/tidwall/gjson v1.7.4/go.mod h1:5/xDoumyyDNerp2U36lyolv46b3uF/9Bu6OfyQ9GImk=
+github.com/tidwall/grect v0.1.1 h1:+kMEkxhoqB7rniVXzMEIA66XwU07STgINqxh+qVIndY=
+github.com/tidwall/grect v0.1.1/go.mod h1:CzvbGiFbWUwiJ1JohXLb28McpyBsI00TK9Y6pDWLGRQ=
+github.com/tidwall/lotsa v1.0.2/go.mod h1:X6NiU+4yHA3fE3Puvpnn1XMDrFZrE9JO2/w+UMuqgR8=
+github.com/tidwall/match v1.0.3 h1:FQUVvBImDutD8wJLN6c5eMzWtjgONK9MwIBCOrUJKeE=
+github.com/tidwall/match v1.0.3/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
+github.com/tidwall/pretty v1.1.0 h1:K3hMW5epkdAVwibsQEfR/7Zj0Qgt4DxtNumTq/VloO8=
+github.com/tidwall/pretty v1.1.0/go.mod h1:XNkn88O1ChpSDQmQeStsy+sBenx6DDtFZJxhVysOjyk=
+github.com/tidwall/rtred v0.1.2 h1:exmoQtOLvDoO8ud++6LwVsAMTu0KPzLTUrMln8u1yu8=
+github.com/tidwall/rtred v0.1.2/go.mod h1:hd69WNXQ5RP9vHd7dqekAz+RIdtfBogmglkZSRxCHFQ=
+github.com/tidwall/tinyqueue v0.1.1 h1:SpNEvEggbpyN5DIReaJ2/1ndroY8iyEGxPYxoSaymYE=
+github.com/tidwall/tinyqueue v0.1.1/go.mod h1:O/QNHwrnjqr6IHItYrzoHAKYhBkLI67Q096fQP5zMYw=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
diff --git a/migrate-db.go b/migrate-db.go
new file mode 100644
index 0000000..4c85e1f
--- /dev/null
+++ b/migrate-db.go
@@ -0,0 +1,59 @@
+package main
+
+import (
+	"brainbaking.com/go-jamming/app/mf"
+	"brainbaking.com/go-jamming/common"
+	"brainbaking.com/go-jamming/db"
+	"encoding/json"
+	"fmt"
+	"github.com/rs/zerolog/log"
+	"io/ioutil"
+	"os"
+)
+
+func mai() {
+	cnf := common.Configure()
+	os.Remove(cnf.Connection)
+	repo := db.NewMentionRepo(cnf)
+
+	log.Info().Str("dbconfig", cnf.Connection).Msg("Starting migration...")
+	for _, domain := range cnf.AllowedWebmentionSources {
+		fmt.Printf("Processing domain %s...\n", domain)
+		entries, err := os.ReadDir(fmt.Sprintf("%s/%s", cnf.DataPath, domain))
+		if err != nil {
+			log.Fatal().Err(err).Msg("Error while reading import path")
+		}
+
+		for _, file := range entries {
+			filename := fmt.Sprintf("%s/%s/%s", cnf.DataPath, domain, file.Name())
+			data, err := ioutil.ReadFile(filename)
+			if err != nil {
+				log.Fatal().Str("file", filename).Err(err).Msg("Error while reading file")
+			}
+
+			var indiewebData mf.IndiewebData
+			json.Unmarshal(data, &indiewebData)
+			mention := mf.Mention{
+				Source: indiewebData.Source,
+				Target: indiewebData.Target,
+			}
+
+			log.Info().Stringer("wm", mention).Str("file", filename).Msg("Re-saving entry")
+			repo.Save(mention, &indiewebData)
+		}
+	}
+
+	log.Info().Str("dbconfig", cnf.Connection).Msg("Checking for since files...")
+	for _, domain := range cnf.AllowedWebmentionSources {
+		since, err := ioutil.ReadFile(fmt.Sprintf("%s/%s-since.txt", cnf.DataPath, domain))
+		if err != nil {
+			log.Warn().Str("domain", domain).Msg("No since found, skipping")
+			continue
+		}
+
+		log.Info().Str("domain", domain).Str("since", string(since)).Msg("Saving since")
+		repo.UpdateSince(domain, common.IsoToTime(string(since)))
+	}
+
+	log.Info().Str("dbconfig", cnf.Connection).Msg("Done! Check db")
+}
diff --git a/playground.go b/playground.go
deleted file mode 100644
index a34932b..0000000
--- a/playground.go
+++ /dev/null
@@ -1,5 +0,0 @@
-package main
-
-func mainz() {
-	//time.Tick()
-}