perf(query): reduce user query duration (#10037)

# Which Problems Are Solved

The resource usage to query user(s) on the database was high and
therefore could have performance impact.

# How the Problems Are Solved

Database queries involving the users and loginnames table were improved
and an index was added for user by email query.

# Additional Changes

- spellchecks
- updated apis on load tests

# additional info

needs cherry pick to v3

cmd/setup/58.go

@@ -0,0 +1,49 @@
+package setup
+
+import (
+	"context"
+	"database/sql"
+	"embed"
+	"fmt"
+
+	"github.com/zitadel/logging"
+
+	"github.com/zitadel/zitadel/internal/database"
+	"github.com/zitadel/zitadel/internal/eventstore"
+)
+
+var (
+	//go:embed 58/*.sql
+	replaceLoginNames3View embed.FS
+)
+
+type ReplaceLoginNames3View struct {
+	dbClient *database.DB
+}
+
+func (mig *ReplaceLoginNames3View) Execute(ctx context.Context, _ eventstore.Event) error {
+	var exists bool
+	err := mig.dbClient.QueryRowContext(ctx, func(r *sql.Row) error {
+		return r.Scan(&exists)
+	}, "SELECT exists(SELECT 1 from information_schema.views WHERE table_schema = 'projections' AND table_name = 'login_names3')")
+
+	if err != nil || !exists {
+		return err
+	}
+
+	statements, err := readStatements(replaceLoginNames3View, "58")
+	if err != nil {
+		return err
+	}
+	for _, stmt := range statements {
+		logging.WithFields("file", stmt.file, "migration", mig.String()).Info("execute statement")
+		if _, err := mig.dbClient.ExecContext(ctx, stmt.query); err != nil {
+			return fmt.Errorf("%s %s: %w", mig.String(), stmt.file, err)
+		}
+	}
+	return nil
+}
+
+func (mig *ReplaceLoginNames3View) String() string {
+	return "58_replace_login_names3_view"
+}

cmd/setup/58/01_update_login_names3_view.sql

@@ -0,0 +1,36 @@
+CREATE OR REPLACE VIEW projections.login_names3 AS
+    SELECT
+        u.id AS user_id
+        , CASE
+            WHEN p.must_be_domain THEN CONCAT(u.user_name, '@', d.name)
+            ELSE u.user_name
+        END AS login_name
+        , COALESCE(d.is_primary, TRUE) AS is_primary
+        , u.instance_id
+    FROM
+        projections.login_names3_users AS u
+    LEFT JOIN LATERAL (
+        SELECT
+            must_be_domain
+            , is_default
+        FROM
+            projections.login_names3_policies AS p
+        WHERE
+            (
+                p.instance_id = u.instance_id
+                AND NOT p.is_default
+                AND p.resource_owner = u.resource_owner
+            ) OR (
+                p.instance_id = u.instance_id
+                AND p.is_default
+            )
+        ORDER BY
+            p.is_default -- custom first
+        LIMIT 1
+    ) AS p ON TRUE
+    LEFT JOIN 
+        projections.login_names3_domains d
+        ON 
+            p.must_be_domain 
+            AND u.resource_owner = d.resource_owner 
+            AND u.instance_id = d.instance_id

cmd/setup/58/02_create_index.sql

@@ -0,0 +1 @@
+CREATE INDEX CONCURRENTLY IF NOT EXISTS login_names3_policies_is_default_owner_idx ON projections.login_names3_policies (instance_id, is_default, resource_owner) INCLUDE (must_be_domain)

cmd/setup/config.go

@@ -154,6 +154,7 @@ type Steps struct {
 	s55ExecutionHandlerStart                *ExecutionHandlerStart
 	s56IDPTemplate6SAMLFederatedLogout      *IDPTemplate6SAMLFederatedLogout
 	s57CreateResourceCounts                 *CreateResourceCounts
+	s58ReplaceLoginNames3View               *ReplaceLoginNames3View
 }
 
 func MustNewSteps(v *viper.Viper) *Steps {

cmd/setup/setup.go

@@ -216,6 +216,7 @@ func Setup(ctx context.Context, config *Config, steps *Steps, masterKey string)
 	steps.s55ExecutionHandlerStart = &ExecutionHandlerStart{dbClient: dbClient}
 	steps.s56IDPTemplate6SAMLFederatedLogout = &IDPTemplate6SAMLFederatedLogout{dbClient: dbClient}
 	steps.s57CreateResourceCounts = &CreateResourceCounts{dbClient: dbClient}
+	steps.s58ReplaceLoginNames3View = &ReplaceLoginNames3View{dbClient: dbClient}
 
 	err = projection.Create(ctx, dbClient, eventstoreClient, config.Projections, nil, nil, nil)
 	logging.OnError(err).Fatal("unable to start projections")
@@ -262,6 +263,7 @@ func Setup(ctx context.Context, config *Config, steps *Steps, masterKey string)
 		steps.s55ExecutionHandlerStart,
 		steps.s56IDPTemplate6SAMLFederatedLogout,
 		steps.s57CreateResourceCounts,
+		steps.s58ReplaceLoginNames3View,
 	} {
 		setupErr = executeMigration(ctx, eventstoreClient, step, "migration failed")
 		if setupErr != nil {