Proper DB migration

migration/ids.2.cr

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+class CreateIds < MG::Base
+  def up : String
+    <<-SQL
+    CREATE TABLE IF NOT EXISTS ids (
+      path TEXT NOT NULL,
+      id TEXT NOT NULL,
+      is_title INTEGER NOT NULL
+    );
+    CREATE UNIQUE INDEX IF NOT EXISTS path_idx ON ids (path);
+    CREATE UNIQUE INDEX IF NOT EXISTS id_idx ON ids (id);
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    DROP TABLE ids;
+    SQL
+  end
+end

migration/tags.4.cr

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+class CreateTags < MG::Base
+  def up : String
+    <<-SQL
+    CREATE TABLE IF NOT EXISTS tags (
+      id TEXT NOT NULL,
+      tag TEXT NOT NULL,
+      unique (id, tag)
+    );
+    CREATE INDEX IF NOT EXISTS tags_id_idx ON tags (id);
+    CREATE INDEX IF NOT EXISTS tags_tag_idx ON tags (tag);
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    DROP TABLE tags;
+    SQL
+  end
+end

migration/thumbnails.3.cr

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+class CreateThumbnails < MG::Base
+  def up : String
+    <<-SQL
+    CREATE TABLE IF NOT EXISTS thumbnails (
+      id TEXT NOT NULL,
+      data BLOB NOT NULL,
+      filename TEXT NOT NULL,
+      mime TEXT NOT NULL,
+      size INTEGER NOT NULL
+    );
+    CREATE UNIQUE INDEX IF NOT EXISTS tn_index ON thumbnails (id);
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    DROP TABLE thumbnails;
+    SQL
+  end
+end

migration/users.1.cr

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+class CreateUsers < MG::Base
+  def up : String
+    <<-SQL
+    CREATE TABLE IF NOT EXISTS users (
+      username TEXT NOT NULL,
+      password TEXT NOT NULL,
+      token TEXT,
+      admin INTEGER NOT NULL
+    );
+    CREATE UNIQUE INDEX IF NOT EXISTS username_idx ON users (username);
+    CREATE UNIQUE INDEX IF NOT EXISTS token_idx ON users (token);
+    SQL
+  end
+
+  def down : String
+    <<-SQL
+    DROP TABLE users;
+    SQL
+  end
+end