diff --git a/backend/ddl.sql b/backend/ddl.sql
index d7f793b..32c5ca9 100644
--- a/backend/ddl.sql
+++ b/backend/ddl.sql
@@ -1,7 +1,4 @@
-create table guild (
-	id integer primary key,
-	name blob
-);
+create table guild (id integer primary key, name blob);
 create unique index idx_guild_name on guild(name);
 
 create table player (
@@ -23,4 +20,202 @@ create table note (
 	content blob,
 	timestamp string,
 	player integer references player(id)
-);
\ No newline at end of file
+);
+
+create table audit_log (
+	id integer primary key,
+	table_name text not null,
+	row_id integer not null,
+	action text not null,
+	changes text,
+	timestamp text default current_timestamp
+);
+
+create trigger guild_insert_audit
+after
+insert on guild begin
+insert into audit_log (table_name, row_id, action, changes)
+values (
+		'guild',
+		new.id,
+		'INSERT',
+		json_object('name', new.name)
+	);
+end;
+
+create trigger guild_update_audit
+after
+update on guild begin
+insert into audit_log (table_name, row_id, action, changes)
+values (
+		'guild',
+		new.id,
+		'UPDATE',
+		json_object('old_name', old.name, 'new_name', new.name)
+	);
+end;
+
+create trigger guild_delete_audit
+after delete on guild begin
+insert into audit_log (table_name, row_id, action, changes)
+values (
+		'guild',
+		old.id,
+		'DELETE',
+		json_object('name', old.name)
+	);
+end;
+
+create trigger player_insert_audit
+after
+insert on player begin
+insert into audit_log (table_name, row_id, action, changes)
+values (
+		'player',
+		new.id,
+		'INSERT',
+		json_object('name', new.name, 'guild', new.guild)
+	);
+end;
+
+create trigger player_update_audit
+after
+update on player begin
+insert into audit_log (table_name, row_id, action, changes)
+values (
+		'player',
+		new.id,
+		'UPDATE',
+		json_object(
+			'old_name',
+			old.name,
+			'new_name',
+			new.name,
+			'old_guild',
+			old.guild,
+			'new_guild',
+			new.guild
+		)
+	);
+end;
+
+create trigger player_delete_audit
+after delete on player begin
+insert into audit_log (table_name, row_id, action, changes)
+values (
+		'player',
+		old.id,
+		'DELETE',
+		json_object('name', old.name, 'guild', old.guild)
+	);
+end;
+
+create trigger association_insert_audit
+after
+insert on association begin
+insert into audit_log (table_name, row_id, action, changes)
+values (
+		'association',
+		new.id,
+		'INSERT',
+		json_object('lhs', new.lhs, 'rhs', new.rhs, 'note', new.note)
+	);
+end;
+
+create trigger association_update_audit
+after
+update on association begin
+insert into audit_log (table_name, row_id, action, changes)
+values (
+		'association',
+		new.id,
+		'UPDATE',
+		json_object(
+			'old_lhs',
+			old.lhs,
+			'new_lhs',
+			new.lhs,
+			'old_rhs',
+			old.rhs,
+			'new_rhs',
+			new.rhs,
+			'old_note',
+			old.note,
+			'new_note',
+			new.note
+		)
+	);
+end;
+
+create trigger association_delete_audit
+after delete on association begin
+insert into audit_log (table_name, row_id, action, changes)
+values (
+		'association',
+		old.id,
+		'DELETE',
+		json_object('lhs', old.lhs, 'rhs', old.rhs, 'note', old.note)
+	);
+end;
+
+create trigger note_insert_audit
+after
+insert on note begin
+insert into audit_log (table_name, row_id, action, changes)
+values (
+		'note',
+		new.id,
+		'INSERT',
+		json_object(
+			'content',
+			new.content,
+			'timestamp',
+			new.timestamp,
+			'player',
+			new.player
+		)
+	);
+end;
+
+create trigger note_update_audit
+after
+update on note begin
+insert into audit_log (table_name, row_id, action, changes)
+values (
+		'note',
+		new.id,
+		'UPDATE',
+		json_object(
+			'old_content',
+			old.content,
+			'new_content',
+			new.content,
+			'old_timestamp',
+			old.timestamp,
+			'new_timestamp',
+			new.timestamp,
+			'old_player',
+			old.player,
+			'new_player',
+			new.player
+		)
+	);
+end;
+
+create trigger note_delete_audit
+after delete on note begin
+insert into audit_log (table_name, row_id, action, changes)
+values (
+		'note',
+		old.id,
+		'DELETE',
+		json_object(
+			'content',
+			old.content,
+			'timestamp',
+			old.timestamp,
+			'player',
+			old.player
+		)
+	);
+end;
\ No newline at end of file