feat(skins): Implement custom skin backend.

src/modules/skins/data.py

@@ -0,0 +1,117 @@
+from data import Registry, RowModel, Table
+from data.columns import Integer, Bool, Timestamp, String
+
+
+class CustomSkinData(Registry):
+    class GlobalSkin(RowModel):
+        """
+        Schema
+        ------
+        CREATE TABLE global_available_skins(
+          skin_id SERIAL PRIMARY KEY,
+          skin_name TEXT NOT NULL
+        );
+        CREATE INDEX global_available_skin_names ON global_available_skins (skin_name);
+        """
+        _tablename_ = 'global_available_skins'
+        _cache_ = {}
+
+        skin_id = Integer(primary=True)
+        skin_name = String()
+
+    class CustomisedSkin(RowModel):
+        """
+        Schema
+        ------
+        CREATE TABLE customised_skins(
+          custom_skin_id SERIAL PRIMARY KEY,
+          base_skin_id INTEGER REFERENCES global_available_skins (skin_id),
+          _timestamp TIMESTAMPTZ DEFAULT now()
+        );
+        """
+        _tablename_ = 'customised_skins'
+
+        custom_skin_id = Integer(primary=True)
+        base_skin_id = Integer()
+
+        _timestamp = Timestamp()
+
+    """
+    Schema
+    ------
+    CREATE TABLE customised_skin_property_ids(
+      property_id SERIAL PRIMARY KEY,
+      card_id TEXT NOT NULL,
+      property_name TEXT NOT NULL,
+      UNIQUE(card_id, property_name)
+    );
+    """
+    skin_property_map = Table('customised_skin_property_ids')
+
+    """
+    Schema
+    ------
+    CREATE TABLE customised_skin_properties(
+      custom_skin_id INTEGER NOT NULL REFERENCES customised_skins (custom_skin_id),
+      property_id INTEGER NOT NULL REFERENCES customised_skin_property_ids (property_id),
+      value TEXT NOT NULL,
+      PRIMARY KEY (custom_skin_id, property_id)
+    );
+    CREATE INDEX customised_skin_property_skin_id ON customised_skin_properties(custom_skin_id);
+    """
+    skin_properties = Table('customised_skin_properties')
+
+    """
+    Schema
+    ------
+    CREATE VIEW customised_skin_data AS
+      SELECT
+        skins.custom_skin_id AS custom_skin_id,
+        skins.base_skin_id AS base_skin_id,
+        properties.property_id AS property_id,
+        prop_ids.card_id AS card_id,
+        prop_ids.property_name AS property_name,
+        properties.value AS value
+      FROM
+        customised_skins skins
+      LEFT JOIN customised_skin_properties properties ON skins.custom_skin_id = properties.custom_skin_id
+      LEFT JOIN customised_skin_property_ids prop_ids ON properties.property_id = prop_ids.property_id;
+    """
+    custom_skin_info = Table('customised_skin_data')
+
+    class UserSkin(RowModel):
+        """
+        Schema
+        ------
+        CREATE TABLE user_skin_inventory(
+          itemid SERIAL PRIMARY KEY,
+          userid BIGINT NOT NULL REFERENCES user_config (userid) ON DELETE CASCADE,
+          custom_skin_id INTEGER NOT NULL REFERENCES customised_skins (custom_skin_id) ON DELETE CASCADE,
+          transactionid INTEGER REFERENCES gem_transactions (transactionid),
+          active BOOLEAN NOT NULL DEFAULT FALSE,
+          acquired_at TIMESTAMPTZ DEFAULT now(),
+          expires_at TIMESTAMPTZ
+        );
+        CREATE INDEX user_skin_inventory_users ON user_skin_inventory(userid);
+        CREATE UNIQUE INDEX user_skin_inventory_active ON user_skin_inventory(userid) WHERE active = TRUE;
+        """
+        _tablename_ = 'user_skin_inventory'
+
+        itemid = Integer(primary=True)
+        userid = Integer()
+        custom_skin_id = Integer()
+        transactionid = Integer()
+        active = Bool()
+        acquired_at = Timestamp()
+        expires_at = Timestamp()
+
+    """
+    Schema
+    ------
+    CREATE VIEW user_active_skins AS
+      SELECT
+        *
+      FROM user_skin_inventory
+      WHERE active=True;
+    """
+    user_active_skins = Table('user_active_skins')