(data): Migration v4 -> v5.

Add migration script for v4 -> v5.
Bump data version in schema and constants.

bot/constants.py

@@ -1,2 +1,2 @@
 CONFIG_FILE = "config/bot.conf"
-DATA_VERSION = 4
+DATA_VERSION = 5

data/migration/v4-v5/migration.sql

@@ -0,0 +1,36 @@
+CREATE TABLE reaction_role_messages(
+  messageid BIGINT PRIMARY KEY,
+  guildid BIGINT NOT NULL REFERENCES guild_config (guildid) ON DELETE CASCADE,
+  channelid BIGINT NOT NULL,
+  enabled BOOLEAN DEFAULT TRUE,
+  required_role BIGINT,
+  removable BOOLEAN,
+  maximum INTEGER,
+  refunds BOOLEAN,
+  event_log BOOLEAN,
+  default_price INTEGER
+);
+CREATE INDEX reaction_role_guilds ON reaction_role_messages (guildid);
+
+CREATE TABLE reaction_role_reactions(
+  reactionid SERIAL PRIMARY KEY,
+  messageid BIGINT NOT NULL REFERENCES reaction_role_messages (messageid) ON DELETE CASCADE,
+  roleid BIGINT NOT NULL,
+  emoji_name TEXT,
+  emoji_id BIGINT,
+  emoji_animated BOOLEAN,
+  price INTEGER,
+  timeout INTEGER
+);
+CREATE INDEX reaction_role_reaction_messages ON reaction_role_reactions (messageid);
+
+CREATE TABLE reaction_role_expiring(
+  guildid BIGINT NOT NULL,
+  userid BIGINT NOT NULL,
+  roleid BIGINT NOT NULL,
+  expiry TIMESTAMPTZ NOT NULL,
+  reactionid INTEGER REFERENCES reaction_role_reactions (reactionid) ON DELETE SET NULL
+);
+CREATE UNIQUE INDEX reaction_role_expiry_members ON reaction_role_expiring (guildid, userid, roleid);
+
+INSERT INTO VersionHistory (version, author) VALUES (5, 'v4-v5 Migration');

data/schema.sql

@@ -4,7 +4,7 @@ CREATE TABLE VersionHistory(
   time TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP NOT NULL,
   author TEXT
 );
-INSERT INTO VersionHistory (version, author) VALUES (4, 'Initial Creation');
+INSERT INTO VersionHistory (version, author) VALUES (5, 'Initial Creation');
 
 
 CREATE OR REPLACE FUNCTION update_timestamp_column()