Add Cloud.ru Managed PostgreSQL results

[belo4ya]

This PR adds benchmark results for Cloud.ru Managed PostgreSQL.

Included results

• 4vCPU/16GB, SF=6849
• 16vCPU/64GB, SF=6849
• 16vCPU/64GB, SF=34247

Tested setup

• Single-node clusters
• Instance types: gen-4-16 (4vCPU/16GB) and gen-16-64 (16vCPU/64GB)
• Storage: 1050GB - SSD NVMe (50K IOPS)
• PostgreSQL version: 18.3 (Debian 18.3-1.pgdg13+1)
• Direct database connection, without a pooler
• Mostly default configuration, with only max_connections increased from 100 to 1000 to support 256 pgbench clients

Client machine

16vCPU/64GB VM located in the same availability zone as the tested database instance.

pgbench --version && psql --version
pgbench (PostgreSQL) 18.3 (Ubuntu 18.3-1.pgdg24.04+1)
psql (PostgreSQL) 18.3 (Ubuntu 18.3-1.pgdg24.04+1)

Reproduction

Example environment:

export PGHOST="<host>"
export PGPORT=5432
export PGUSER="dbadmin"
export PGPASSWORD="<password>"
export PGDATABASE="postgresbench"
export PGSSLMODE=prefer

export SYSTEM_NAME="Cloud.ru"
export INSTANCE_TYPE="gen-4-16" # or gen-16-64
export VCPUS=4 # or 16
export RAM_GB=16 # or 64

export INSTANCE_STORAGE=""
export PRIMARY_STORAGE="1050 GB - SSD NVMe (50K IOPS)"

export CLUSTER_SIZE=1
export TUNED="no"

export SCALE_FACTOR=6849 # or 34247
export CLIENTS=256
export THREADS=16
export DURATION=600

export OUT_JSON="cloudru/results/cloudru_4cpu_16gb_6849.json"
# or:
# cloudru/results/cloudru_16cpu_64gb_6849.json
# cloudru/results/cloudru_16cpu_64gb_34247.json

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