diff --git a/docker-compose.yml b/docker-compose.yml
index 410b55e..03cc49f 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -14,6 +14,8 @@ services:
       PGUSER: *pguser
       PGPASSWORD: *pgpass
       PGDATABASE: *pgdb
+
+      WANIKANI_API_KEY: # required to cache to database in advance
     ports:
       - 5433:5432 # pgAdmin connection port
 
diff --git a/initdb.d/01-function.sql b/initdb.d/01-function.sql
index 42db199..2c6e7e1 100755
--- a/initdb.d/01-function.sql
+++ b/initdb.d/01-function.sql
@@ -24,3 +24,8 @@ CREATE OR REPLACE FUNCTION identity (JSONB) RETURNS JSONB AS
 $func$
 SELECT $1;
 $func$ LANGUAGE SQL IMMUTABLE;
+
+CREATE OR REPLACE FUNCTION identity (TEXT) RETURNS TEXT AS
+$func$
+SELECT $1;
+$func$ LANGUAGE SQL IMMUTABLE;
diff --git a/initdb.d/10-wanikani.sql b/initdb.d/10-wanikani.sql
index d001036..f277306 100755
--- a/initdb.d/10-wanikani.sql
+++ b/initdb.d/10-wanikani.sql
@@ -17,6 +17,10 @@ CREATE TABLE "wanikani.subjects" (
 );
 
 CREATE INDEX "idx_wanikani.subjects_object" ON "wanikani.subjects" ("object");
+
+CREATE INDEX "idx_wanikani.subjects_data-characters" ON "wanikani.subjects" (("data" ->> 'characters'));
+CREATE INDEX "idx_wanikani.subjects_data-level" ON "wanikani.subjects" ((("data" -> 'level')::int));
+
 CREATE INDEX "idx_wanikani.subjects_data" ON "wanikani.subjects"
   USING pgroonga("data")
   WITH (
@@ -29,3 +33,32 @@ CREATE INDEX "idx_wanikani.subjects_data_kana" ON "wanikani.subjects"
     tokenizer='TokenMecab',
     normalizer='NormalizerNFKC100("unify_kana", true)'
   );
+
+CREATE MATERIALIZED VIEW "wanikani.subjects.sentences" AS (
+  SELECT
+    (s ->> 'ja') "ja",
+    (s ->> 'en') "en"
+  FROM "wanikani.subjects", jsonb_array_elements("data" -> 'context_sentences') "s"
+  WHERE s ->> 'ja' > ''
+);
+
+CREATE INDEX "idx_wanikani.subjects.sentences_ja" ON "wanikani.subjects.sentences"
+  USING pgroonga("ja")
+  WITH (
+    tokenizer='TokenMecab',
+    normalizer='NormalizerNFKC100("unify_kana", true)'
+  );
+
+CREATE INDEX "idx_wanikani.subjects.sentences_ja_kana" ON "wanikani.subjects.sentences"
+  USING pgroonga((identity("ja")))
+  WITH (
+    tokenizer='TokenMecab("use_reading", true)',
+    normalizer='NormalizerNFKC100("unify_kana", true)'
+  );
+
+CREATE INDEX "idx_wanikani.subjects.sentences_en" ON "wanikani.subjects.sentences"
+  USING pgroonga("en")
+  WITH (
+    plugins='token_filters/stem',
+    token_filters='TokenFilterStem'
+  );
diff --git a/initdb.d/22-entry.sql b/initdb.d/22-entry.sql
index 5fcaf77..6ed8a91 100755
--- a/initdb.d/22-entry.sql
+++ b/initdb.d/22-entry.sql
@@ -4,6 +4,10 @@ CREATE TABLE "entry" (
     "updatedAt"     TIMESTAMPTZ DEFAULT now(),
     "userId"        UUID NOT NULL REFERENCES "user"("id") ON DELETE CASCADE,
     "type"          TEXT NOT NULL,
+    "_type"         TEXT[] GENERATED ALWAYS AS (CASE
+        WHEN "type" = 'character' THEN ARRAY['character', 'hanzi', 'kanji']
+        ELSE ARRAY["type"]
+    END) STORED,
     "entry"         TEXT[] NOT NULL CHECK ("entry"[1] IS NOT NULL),
     "reading"       JSONB NOT NULL DEFAULT '{}',    -- TODO: jsonschema
     "translation"   JSONB NOT NULL DEFAULT '{}',    -- TODO: jsonschema
@@ -11,9 +15,14 @@ CREATE TABLE "entry" (
     "tag"           TEXT[] NOT NULL DEFAULT '{}',
     "level"         FLOAT,
     "level.kanji"   INT,
-    "frequency"     FLOAT,
     "key"           TEXT UNIQUE,
     "_meta"         JSONB,                          -- TODO: jsonschema
+    "priority"      INT GENERATED ALWAYS AS (CASE
+        WHEN "type" = 'vocabulary' THEN 10
+        WHEN "type" = 'character' THEN 5
+        WHEN "type" = 'sentence' THEN 1
+        ELSE 0
+    END) STORED,
     PRIMARY KEY ("id")
 );
 
@@ -22,12 +31,13 @@ CREATE TRIGGER "t_entry_updatedAt"
     FOR EACH ROW
     EXECUTE PROCEDURE "f_updatedAt"();
 
+CREATE INDEX "idx_entry_priority" ON "entry" ("priority");
+
 CREATE INDEX "idx_entry_updatedAt" ON "entry" ("updatedAt");
 CREATE INDEX "idx_entry_userId" ON "entry" ("userId");
-CREATE INDEX "idx_entry_type" ON "entry" ("type");
+CREATE INDEX "idx_entry_type" ON "entry" USING GIN("_type");
 CREATE INDEX "idx_entry_level" ON "entry" ("level");
 CREATE INDEX "idx_entry_level.kanji" ON "entry" ("level.kanji");
-CREATE INDEX "idx_entry_frequency" ON "entry" ("frequency");
 
 CREATE INDEX "idx_entry_description" ON "entry"
     USING pgroonga("description")
diff --git a/initdb.d/24-preset.sql b/initdb.d/24-preset.sql
index 0b3f93c..7a4590c 100755
--- a/initdb.d/24-preset.sql
+++ b/initdb.d/24-preset.sql
@@ -1,4 +1,4 @@
-CREATE TABLE "preset.quiz" (
+CREATE TABLE "quiz.preset" (
     "id"              UUID NOT NULL PRIMARY KEY DEFAULT uuid_generate_v4(),
     "createdAt"       TIMESTAMPTZ DEFAULT now(),
     "updatedAt"       TIMESTAMPTZ DEFAULT now(),
@@ -7,12 +7,12 @@ CREATE TABLE "preset.quiz" (
     "settings"        JSONB NOT NULL
 );
 
-CREATE TRIGGER "t_preset.quiz_updatedAt"
-    BEFORE UPDATE ON "preset.quiz"
+CREATE TRIGGER "t_quiz.preset_updatedAt"
+    BEFORE UPDATE ON "quiz.preset"
     FOR EACH ROW
     EXECUTE PROCEDURE "f_updatedAt"();
 
-CREATE INDEX "idx_preset.quiz_updatedAt" ON "preset.quiz" ("updatedAt");
-CREATE INDEX "idx_preset.quiz_userId" ON "preset.quiz" ("userId");
-CREATE INDEX "idx_preset.quiz_name" ON "preset.quiz"
+CREATE INDEX "idx_quiz.preset_updatedAt" ON "quiz.preset" ("updatedAt");
+CREATE INDEX "idx_quiz.preset_userId" ON "quiz.preset" ("userId");
+CREATE INDEX "idx_quiz.preset_name" ON "quiz.preset"
     USING pgroonga ("name");
diff --git a/initdb.d/27-freq.sql b/initdb.d/27-freq.sql
index 6212051..cc821be 100644
--- a/initdb.d/27-freq.sql
+++ b/initdb.d/27-freq.sql
@@ -4,4 +4,7 @@ CREATE TABLE "frequency" (
   PRIMARY KEY ("entry")
 );
 
-CREATE INDEX "idx_frequency_frequency" ON "frequency"("frequency");
+CREATE INDEX "idx_frequency_frequency" ON "frequency" ("frequency");
+CREATE INDEX "idx_frequency_entry" ON "frequency"
+  USING pgroonga("entry")
+  WITH (normalizer='NormalizerNFKC100("unify_kana", true)');