diff --git a/sam/db/schema/mysql/20180704080000.base.up.sql b/sam/db/schema/mysql/20180704080000.base.up.sql
new file mode 100644
index 000000000..dedf7d411
--- /dev/null
+++ b/sam/db/schema/mysql/20180704080000.base.up.sql
@@ -0,0 +1,104 @@
+-- all known organisations (crust instances) and our relation towards them
+CREATE TABLE organisations (
+  id               BIGINT UNSIGNED NOT NULL,
+  fqn              TEXT            NOT NULL, -- fully qualified name of the organisation
+  label            TEXT            NOT NULL, -- display name of the organisation
+
+  PRIMARY KEY (id)
+);
+
+-- Keeps all known teams
+CREATE TABLE teams (
+  id               BIGINT UNSIGNED NOT NULL,
+  label            TEXT            NOT NULL, -- display name of the team
+  handle           TEXT            NOT NULL, -- team handle string
+
+  PRIMARY KEY (id)
+);
+
+-- Keeps all known channels
+CREATE TABLE channels (
+  id               BIGINT UNSIGNED NOT NULL,
+  label            TEXT            NOT NULL, -- display name of the channel
+  meta             JSON            NOT NULL,
+
+  PRIMARY KEY (id)
+);
+
+-- Keeps all known users, home and external organisation
+--   changes are stored in audit log
+CREATE TABLE users (
+  id               BIGINT UNSIGNED NOT NULL,
+  username         TEXT            NOT NULL,
+  password         TEXT,
+  meta             JSON            NOT NULL,
+
+  rel_organisation BIGINT UNSIGNED NOT NULL REFERENCES organisation(id),
+
+  PRIMARY KEY (id)
+);
+
+-- Keeps team memberships
+CREATE TABLE team_members (
+  rel_team         BIGINT UNSIGNED NOT NULL REFERENCES organisation(id),
+  rel_user         BIGINT UNSIGNED NOT NULL REFERENCES users(id),
+
+  PRIMARY KEY (rel_team, rel_user)
+);
+
+-- handles membership, visibility and level of access
+CREATE TABLE channel_members (
+  rel_channel      BIGINT UNSIGNED NOT NULL REFERENCES channels(id),
+  rel_user         BIGINT UNSIGNED NOT NULL REFERENCES users(id),
+
+  -- display only messages from-to to particular user/organisation
+  messages_since   DATETIME            NULL,
+  messages_until   DATETIME            NULL,
+
+  PRIMARY KEY (rel_channel, rel_user)
+);
+
+CREATE TABLE messages (
+  id               BIGINT UNSIGNED NOT NULL,
+
+  -- basic set:
+  --    NULL                            for common text messages
+  --    image/*; disposition=inline     for inline images (does not follow stdandard http headers, but
+  --    crust/system                    body holds one of defined system messages (user joining, parting...)
+  --    crust/reaction                  body holds reaction to a message
+  --    crust/preview                   body holds preview of the message it relates to in form of metadata (no binary blobs!)
+  --    crust/url                       body holds only URL
+  --    crust/pin                       message it relates to is pinned, body holds pin details
+  --    crust/flag                      message it relates to is flaged, body holds flag information
+  --    */*                             body holds reference to the uploaded file and its metadata
+  --
+  mimetype         VARCHAR(255)         NULL,
+
+  -- null body only valid when rel_message is set => message removal
+  body             TEXT                 NULL,
+
+  -- the contributor
+  rel_user         BIGINT  UNSIGNED NOT NULL REFERENCES users(id),
+
+  -- message's channel
+  rel_channel      BIGINT  UNSIGNED NOT NULL REFERENCES channels(id),
+
+  -- replies, edits, reactions, flags, attachments...
+  rel_message      BIGINT  UNSIGNED NOT NULL REFERENCES messages(id),
+
+  PRIMARY KEY (id)
+);
+
+
+CREATE TABLE channel_views (
+  rel_channel      BIGINT UNSIGNED NOT NULL REFERENCES channels(id),
+  rel_user         BIGINT UNSIGNED NOT NULL REFERENCES users(id),
+
+  -- timestamp of last view, should be enough to find out which messaghr
+  viewed_at        DATETIME        NOT NULL DEFAULT NOW(),
+
+  -- new messages count since last view
+  new_since        INT    UNSIGNED NOT NULL DEFAULT 0,
+
+  PRIMARY KEY (rel_user, rel_channel)
+);
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