diff --git a/server/db/schema_3.0.sql b/server/db/schema_3.0.sql
new file mode 100644
index 0000000..18de924
--- /dev/null
+++ b/server/db/schema_3.0.sql
@@ -0,0 +1,132 @@
+CREATE TABLE users
+(
+    user_id            INTEGER                             PRIMARY KEY AUTOINCREMENT,
+
+    username           TEXT                                    NULL  DEFAULT NULL,
+
+    read_key           TEXT                                NOT NULL,
+    send_key           TEXT                                NOT NULL,
+    admin_key          TEXT                                NOT NULL,
+
+    timestamp_created  TEXT                                NOT NULL   DEFAULT CURRENT_TIMESTAMP,
+    timestamp_lastread TEXT                                    NULL   DEFAULT NULL,
+    timestamp_lastsent TEXT                                    NULL   DEFAULT NULL,
+
+    messages_sent      INTEGER                             NOT NULL   DEFAULT '0',
+
+    quota_today        INTEGER                             NOT NULL   DEFAULT '0',
+    quota_day          TEXT                                    NULL   DEFAULT NULL,
+
+    is_pro             INTEGER   CHECK(is_pro IN (0, 1))   NOT NULL   DEFAULT 0,
+    pro_token          TEXT                                    NULL   DEFAULT NULL,
+
+    PRIMARY KEY (user_id)
+);
+CREATE UNIQUE INDEX "idx_users_protoken" ON users (pro_token);
+
+
+CREATE TABLE clients
+(
+    client_id INTEGER PRIMARY KEY AUTOINCREMENT,
+
+    user_id   INTEGER NOT NULL,
+
+    type      TEXT    NOT NULL,
+
+    fcm_token TEXT        NULL,
+
+    PRIMARY KEY (client_id)
+);
+CREATE        INDEX "idx_clients_userid"   ON clients (user_id);
+CREATE UNIQUE INDEX "idx_clients_fcmtoken" ON clients (fcm_token);
+
+
+CREATE TABLE channels
+(
+    channel_id         INTEGER     PRIMARY KEY AUTOINCREMENT,
+
+    owner_user_id      INTEGER     NOT NULL,
+
+    name               TEXT        NOT NULL,
+
+    subscribe_key      TEXT        NOT NULL,
+    send_key           TEXT        NOT NULL,
+
+    messages_sent      INTEGER     NOT NULL   DEFAULT '0',
+
+    timestamp_created  TEXT        NOT NULL   DEFAULT CURRENT_TIMESTAMP,
+    timestamp_lastread TEXT            NULL   DEFAULT NULL,
+    timestamp_lastsent TEXT            NULL   DEFAULT NULL,
+
+    PRIMARY KEY (channel_id)
+);
+CREATE UNIQUE INDEX "idx_channels_identity" ON channels (owner_user_id, name);
+
+CREATE TABLE subscriptions
+(
+    subscription_id        INTEGER    PRIMARY KEY AUTOINCREMENT,
+
+    subscriber_user_id     INTEGER    NOT NULL,
+    channel_owner_user_id  INTEGER    NOT NULL,
+    channel_name           TEXT       NOT NULL,
+
+    PRIMARY KEY (subscription_id)
+);
+CREATE UNIQUE INDEX "idx_subscriptions_ref" ON subscriptions (subscriber_user_id, channel_owner_user_id, channel_name);
+
+
+CREATE TABLE messages
+(
+    scn_message_id     INTEGER                                  PRIMARY KEY AUTOINCREMENT,
+    sender_user_id     INTEGER                                  NOT NULL,
+    channel_name       TEXT                                     NOT NULL,
+
+    channel_id         INTEGER                                  NOT NULL,
+
+    timestamp_real     TEXT                                     NOT NULL   DEFAULT CURRENT_TIMESTAMP,
+    timestamp_client   TEXT                                         NULL,
+
+    title              TEXT                                     NOT NULL,
+    content            TEXT                                         NULL,
+    priority           INTEGER  CHECK(priority IN (0, 1, 2))    NOT NULL,
+    usr_message_id     TEXT                                     NULL,
+
+    PRIMARY KEY (scn_message_id)
+);
+CREATE INDEX "idx_messages_channel"     ON messages (sender_user_id, channel_name);
+CREATE INDEX "idx_messages_idempotency" ON messages (sender_user_id, usr_message_id);
+
+
+CREATE TABLE deliveries
+(
+    delivery_id         INTEGER                                                  PRIMARY KEY AUTOINCREMENT,
+
+    scn_message_id      INTEGER                                                  NOT NULL,
+    receiver_user_id    INTEGER                                                  NOT NULL,
+    receiver_client_id  INTEGER                                                  NOT NULL,
+
+    timestamp_created   TEXT                                                     NOT NULL   DEFAULT CURRENT_TIMESTAMP,
+    timestamp_finalized TEXT                                                     NOT NULL   DEFAULT CURRENT_TIMESTAMP,
+
+
+    status              TEXT     CHECK(status IN ('RETRY','SUCCESS','FAILED'))   NOT NULL,
+    retry_count         INTEGER                                                  NOT NULL   DEFAULT 0,
+
+    fcm_message_id      TEXT                                                         NULL,
+
+    PRIMARY KEY (delivery_id)
+);
+CREATE INDEX "idx_deliveries_receiver" ON deliveries (scn_message_id, receiver_client_id);
+
+
+CREATE TABLE `meta`
+(
+    meta_key     TEXT       NOT NULL,
+    value_int    INTEGER        NULL,
+    value_txt    TEXT           NULL,
+    value_real   REAL           NULL,
+    value_blob   BLOB           NULL,
+
+    PRIMARY KEY (meta_key)
+);
+INSERT INTO meta (meta_key, value_int) VALUES ('schema', 3)
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