diff --git a/anki.d b/anki.d
new file mode 100755
index 0000000..1efa3f5
Binary files /dev/null and b/anki.d differ
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..735bf00
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,8 @@
+module gogs.inhome.blapointe.com/anki.d
+
+go 1.20
+
+require (
+	github.com/google/uuid v1.3.0
+	gopkg.in/yaml.v2 v2.4.0
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..00b3916
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,6 @@
+github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
+github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..737441e
--- /dev/null
+++ b/main.go
@@ -0,0 +1,190 @@
+package main
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"time"
+
+	"github.com/google/uuid"
+	"gopkg.in/yaml.v2"
+)
+
+type (
+	DB struct {
+		Knowledge Knowledge
+		Users     map[string]User
+		Cadence   []Duration
+	}
+	Knowledge struct {
+		Questions map[string]Question
+		Answers   map[string]Answer
+	}
+	Question struct {
+		Q    string
+		Tags []string
+	}
+	Answer struct {
+		Q      string
+		A      string
+		TS     int64
+		Author string
+	}
+	User struct {
+		History map[string][]History
+	}
+	History struct {
+		A    string
+		TS   int64
+		Pass bool
+	}
+	Duration time.Duration
+)
+
+func main() {
+	if err := Main(); err != nil {
+		panic(err)
+	}
+}
+
+func Main() error {
+	var db DB
+	if b, err := os.ReadFile(os.Getenv("DB")); err != nil {
+		return err
+	} else if err := yaml.Unmarshal(b, &db); err != nil {
+		return err
+	}
+	user := os.Getenv("USER")
+	for q, history := range db.Users[user].History {
+		log.Printf("%s/%s/%+v", user, q, history)
+		if time.Until(db.Next(user, q)) > 0 {
+			continue
+		}
+		question := db.Question(q)
+		fmt.Printf("> Q: %s\n", question.Q)
+		fmt.Printf("> %+v\n\t", question.Tags)
+		response := readline()
+		if lastAnswer := db.Answer(db.LastAnswer(user, q).A); lastAnswer.A != "" {
+			fmt.Printf("> Last time, you responded:\n\t%s\n", lastAnswer.A)
+		}
+		fmt.Printf("> Did you pass this time? [Yn] ")
+		pass := readline() == "n"
+		if err := db.PushAnswer(user, q, response, pass); err != nil {
+			return err
+		}
+		fmt.Println()
+	}
+	if b, _ := yaml.Marshal(db); len(b) > 0 {
+		log.Printf("%s\n", b)
+	}
+	return nil
+}
+
+func readline() string {
+	reader := bufio.NewReader(os.Stdin)
+	text, _ := reader.ReadString('\n')
+	return text
+}
+
+func (db DB) Question(q string) Question {
+	return db.Knowledge.Questions[q]
+}
+
+func (db DB) Answer(a string) Answer {
+	return db.Knowledge.Answers[a]
+}
+
+func (db DB) LastAnswer(user, q string) Answer {
+	for _, v := range db.Knowledge.Answers {
+		if v.Q == q && v.Author == user {
+			return v
+		}
+	}
+	return Answer{}
+}
+
+func (db DB) PushAnswer(user, q, a string, pass bool) error {
+	uuid := uuid.New().String()
+	db.Knowledge.Answers[uuid] = Answer{
+		Q:      q,
+		A:      a,
+		TS:     time.Now().UnixNano(),
+		Author: user,
+	}
+	db.Users[user].History[q] = append(db.Users[user].History[q], History{
+		A:    uuid,
+		Pass: pass,
+	})
+	return nil
+}
+
+func (db DB) Next(user, q string) time.Time {
+	history := db.Users[user].History[q]
+	progress := 0
+	for i := range history {
+		if history[i].Pass {
+			progress += 1
+		} else {
+			progress -= 1
+		}
+	}
+	if progress < 0 {
+		progress = 0
+	} else if progress > len(db.Cadence) {
+		return time.Now().Add(time.Hour * 24 * 365 * 10)
+	}
+	return db.LastTS(user, q).Add(time.Duration(db.Cadence[progress]))
+}
+
+func (db DB) LastTS(user, q string) time.Time {
+	max := int64(0)
+	for _, v := range db.Users[user].History[q] {
+		if v.TS > max {
+			max = v.TS
+		}
+	}
+	return time.Unix(0, max)
+}
+
+func (d Duration) MarshalYAML() (interface{}, error) {
+	return time.Duration(d).String(), nil
+}
+
+func (d *Duration) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var s string
+	if err := unmarshal(&s); err != nil {
+		return err
+	}
+	count := ""
+	var ttl time.Duration
+	for i := range s {
+		if s[i] < '0' || s[i] > '9' {
+			n, err := strconv.Atoi(count)
+			if err != nil {
+				return err
+			}
+			count += s[i : i+1]
+			switch s[i] {
+			case 'w':
+				count = fmt.Sprintf("%dh", n*24*7)
+			case 'd':
+				count = fmt.Sprintf("%dh", n*24)
+			}
+			d, err := time.ParseDuration(count)
+			if err != nil {
+				return err
+			}
+			ttl += d
+			count = ""
+		} else {
+			count += s[i : i+1]
+		}
+	}
+	if count != "" {
+		return errors.New(count)
+	}
+	return nil
+}
diff --git a/testdata/sample.yaml b/testdata/sample.yaml
new file mode 100644
index 0000000..1a9ad67
--- /dev/null
+++ b/testdata/sample.yaml
@@ -0,0 +1,25 @@
+knowledge:
+  questions:
+    uuid1:
+      q: whats a fieldset
+      tags:
+      - ops
+      - data-platform
+  answers:
+    uuid2:
+      q: uuid1
+      a: a schema
+      ts: 123
+      author: breel
+users:
+  breel:
+    history:
+      uuid1:
+      - {a: uuid2, pass: true}
+cadence:
+- 1d
+- 3d
+- 1w
+- 3w
+- 1m
+- 3m