diff --git a/pkg/icingadb/schema.go b/pkg/icingadb/schema.go
index aa4735af3..9aa7374e9 100644
--- a/pkg/icingadb/schema.go
+++ b/pkg/icingadb/schema.go
@@ -11,8 +11,8 @@ import (
 )
 
 const (
-	expectedMysqlSchemaVersion    = 5
-	expectedPostgresSchemaVersion = 3
+	expectedMysqlSchemaVersion    = 6
+	expectedPostgresSchemaVersion = 4
 )
 
 // CheckSchema asserts the database schema of the expected version being present.
diff --git a/schema/mysql/schema.sql b/schema/mysql/schema.sql
index 745a5e620..f270d2b74 100644
--- a/schema/mysql/schema.sql
+++ b/schema/mysql/schema.sql
@@ -208,7 +208,7 @@ CREATE TABLE host (
   notes_url_id binary(20) DEFAULT NULL COMMENT 'notes_url.id',
   notes text NOT NULL,
   icon_image_id binary(20) DEFAULT NULL COMMENT 'icon_image.id',
-  icon_image_alt varchar(32) NOT NULL,
+  icon_image_alt text NOT NULL,
 
   zone_name varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL COMMENT 'zone.name',
   zone_id binary(20) DEFAULT NULL COMMENT 'zone.id',
@@ -376,7 +376,7 @@ CREATE TABLE service (
   notes_url_id binary(20) DEFAULT NULL COMMENT 'notes_url.id',
   notes text NOT NULL,
   icon_image_id binary(20) DEFAULT NULL COMMENT 'icon_image.id',
-  icon_image_alt varchar(32) NOT NULL,
+  icon_image_alt text NOT NULL,
 
   zone_name varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL COMMENT 'zone.name',
   zone_id binary(20) DEFAULT NULL COMMENT 'zone.id',
@@ -506,7 +506,7 @@ CREATE TABLE endpoint (
   id binary(20) NOT NULL COMMENT 'sha1(environment.id + name)',
   environment_id binary(20) NOT NULL COMMENT 'environment.id',
   name_checksum binary(20) NOT NULL COMMENT 'sha1(name)',
-  properties_checksum binary(20) NOT NULL,
+  properties_checksum binary(20) NOT NULL COMMENT 'sha1(all properties)',
 
   name varchar(255) NOT NULL,
   name_ci varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
@@ -739,7 +739,7 @@ CREATE TABLE comment (
   service_id binary(20) DEFAULT NULL COMMENT 'service.id',
 
   name_checksum binary(20) NOT NULL COMMENT 'sha1(name)',
-  properties_checksum binary(20) NOT NULL,
+  properties_checksum binary(20) NOT NULL COMMENT 'sha1(all properties)',
   name varchar(548) NOT NULL COMMENT '255+1+255+1+36, i.e. "host.name!service.name!UUID"',
 
   author varchar(255) NOT NULL COLLATE utf8mb4_unicode_ci,
@@ -808,7 +808,7 @@ CREATE TABLE notification (
   id binary(20) NOT NULL COMMENT 'sha1(environment.id + name)',
   environment_id binary(20) NOT NULL COMMENT 'environment.id',
   name_checksum binary(20) NOT NULL COMMENT 'sha1(name)',
-  properties_checksum binary(20) NOT NULL,
+  properties_checksum binary(20) NOT NULL COMMENT 'sha1(all properties)',
 
   name varchar(767) NOT NULL COMMENT '255+1+255+1+255, i.e. "host.name!service.name!notification.name"',
   name_ci varchar(767) COLLATE utf8mb4_unicode_ci NOT NULL,
@@ -934,7 +934,7 @@ CREATE TABLE timeperiod_range (
   timeperiod_id binary(20) NOT NULL COMMENT 'timeperiod.id',
   range_key varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
 
-  range_value varchar(255) NOT NULL,
+  range_value text NOT NULL,
 
   PRIMARY KEY (id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin ROW_FORMAT=DYNAMIC;
@@ -1343,4 +1343,4 @@ CREATE TABLE icingadb_schema (
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin ROW_FORMAT=DYNAMIC;
 
 INSERT INTO icingadb_schema (version, timestamp)
-  VALUES (5, UNIX_TIMESTAMP() * 1000);
+  VALUES (6, UNIX_TIMESTAMP() * 1000);
diff --git a/schema/mysql/upgrades/1.2.1.sql b/schema/mysql/upgrades/1.2.1.sql
new file mode 100644
index 000000000..ed86c6e72
--- /dev/null
+++ b/schema/mysql/upgrades/1.2.1.sql
@@ -0,0 +1,11 @@
+ALTER TABLE host MODIFY COLUMN icon_image_alt TEXT NOT NULL;
+ALTER TABLE service MODIFY COLUMN icon_image_alt TEXT NOT NULL;
+
+ALTER TABLE endpoint MODIFY COLUMN properties_checksum binary(20) NOT NULL COMMENT 'sha1(all properties)';
+ALTER TABLE comment MODIFY COLUMN properties_checksum binary(20) NOT NULL COMMENT 'sha1(all properties)';
+ALTER TABLE notification MODIFY COLUMN properties_checksum binary(20) NOT NULL COMMENT 'sha1(all properties)';
+
+ALTER TABLE timeperiod_range MODIFY COLUMN range_value text NOT NULL;
+
+INSERT INTO icingadb_schema (version, timestamp)
+  VALUES (6, UNIX_TIMESTAMP() * 1000);
diff --git a/schema/pgsql/schema.sql b/schema/pgsql/schema.sql
index 708c9143c..78db645f0 100644
--- a/schema/pgsql/schema.sql
+++ b/schema/pgsql/schema.sql
@@ -235,7 +235,7 @@ CREATE TABLE host (
   notes_url_id bytea20 DEFAULT NULL,
   notes text NOT NULL,
   icon_image_id bytea20 DEFAULT NULL,
-  icon_image_alt varchar(32) NOT NULL,
+  icon_image_alt text NOT NULL,
 
   zone_name citext NOT NULL,
   zone_id bytea20 DEFAULT NULL,
@@ -509,7 +509,7 @@ CREATE TABLE service (
   notes_url_id bytea20 DEFAULT NULL,
   notes text NOT NULL,
   icon_image_id bytea20 DEFAULT NULL,
-  icon_image_alt varchar(32) NOT NULL,
+  icon_image_alt text NOT NULL,
 
   zone_name citext NOT NULL,
   zone_id bytea20 DEFAULT NULL,
@@ -761,6 +761,7 @@ ALTER TABLE endpoint ALTER COLUMN zone_id SET STORAGE PLAIN;
 COMMENT ON COLUMN endpoint.id IS 'sha1(environment.id + name)';
 COMMENT ON COLUMN endpoint.environment_id IS 'environment.id';
 COMMENT ON COLUMN endpoint.name_checksum IS 'sha1(name)';
+COMMENT ON COLUMN endpoint.properties_checksum IS 'sha1(all properties)';
 COMMENT ON COLUMN endpoint.zone_id IS 'zone.id';
 
 CREATE TABLE environment (
@@ -1159,6 +1160,7 @@ COMMENT ON COLUMN comment.environment_id IS 'environment.id';
 COMMENT ON COLUMN comment.host_id IS 'host.id';
 COMMENT ON COLUMN comment.service_id IS 'service.id';
 COMMENT ON COLUMN comment.name_checksum IS 'sha1(name)';
+COMMENT ON COLUMN comment.properties_checksum IS 'sha1(all properties)';
 COMMENT ON COLUMN comment.name IS '255+1+255+1+36, i.e. "host.name!service.name!UUID"';
 COMMENT ON COLUMN comment.zone_id IS 'zone.id';
 
@@ -1288,6 +1290,7 @@ CREATE INDEX idx_notification_service_id ON notification(service_id);
 COMMENT ON COLUMN notification.id IS 'sha1(environment.id + name)';
 COMMENT ON COLUMN notification.environment_id IS 'environment.id';
 COMMENT ON COLUMN notification.name_checksum IS 'sha1(name)';
+COMMENT ON COLUMN notification.properties_checksum IS 'sha1(all properties)';
 COMMENT ON COLUMN notification.name IS '255+1+255+1+255, i.e. "host.name!service.name!notification.name"';
 COMMENT ON COLUMN notification.host_id IS 'host.id';
 COMMENT ON COLUMN notification.service_id IS 'service.id';
@@ -1471,7 +1474,7 @@ CREATE TABLE timeperiod_range (
   timeperiod_id bytea20 NOT NULL,
   range_key citext NOT NULL,
 
-  range_value varchar(255) NOT NULL,
+  range_value text NOT NULL,
 
   CONSTRAINT pk_timeperiod_range PRIMARY KEY (id)
 );
@@ -2181,4 +2184,4 @@ CREATE TABLE icingadb_schema (
 ALTER SEQUENCE icingadb_schema_id_seq OWNED BY icingadb_schema.id;
 
 INSERT INTO icingadb_schema (version, timestamp)
-  VALUES (3, extract(epoch from now()) * 1000);
+  VALUES (4, extract(epoch from now()) * 1000);
diff --git a/schema/pgsql/upgrades/1.2.1.sql b/schema/pgsql/upgrades/1.2.1.sql
new file mode 100644
index 000000000..5989e3a77
--- /dev/null
+++ b/schema/pgsql/upgrades/1.2.1.sql
@@ -0,0 +1,11 @@
+ALTER TABLE host ALTER COLUMN icon_image_alt TYPE text;
+ALTER TABLE service ALTER COLUMN icon_image_alt TYPE text;
+
+COMMENT ON COLUMN endpoint.properties_checksum IS 'sha1(all properties)';
+COMMENT ON COLUMN comment.properties_checksum IS 'sha1(all properties)';
+COMMENT ON COLUMN notification.properties_checksum IS 'sha1(all properties)';
+
+ALTER TABLE timeperiod_range ALTER COLUMN range_value TYPE text;
+
+INSERT INTO icingadb_schema (version, timestamp)
+  VALUES (4, extract(epoch from now()) * 1000);