{
  "checked_on": "2026-11-02",
  "policy": "Baselines are scope boundaries, not claims of latest release. Rolling documentation must be read with release notes. Availability and technical validation are separate.",
  "systems": {
    "postgresql": {
      "version": "PostgreSQL 17",
      "urls": [
        "https://www.postgresql.org/docs/17/mvcc.html",
        "https://www.postgresql.org/docs/17/ddl-system-columns.html",
        "https://www.postgresql.org/docs/17/routine-vacuuming.html",
        "https://www.postgresql.org/docs/17/wal.html",
        "https://www.postgresql.org/docs/17/logical-replication.html",
        "https://www.postgresql.org/docs/17/indexes-types.html",
        "https://www.postgresql.org/docs/17/transaction-iso.html",
        "https://www.postgresql.org/docs/17/using-explain.html",
        "https://www.postgresql.org/docs/17/ddl-partitioning.html",
        "https://www.postgresql.org/docs/17/explicit-locking.html",
        "https://www.postgresql.org/docs/17/continuous-archiving.html"
      ]
    },
    "oracle": {
      "version": "Oracle Database 19c; edition/options проверять отдельно",
      "urls": [
        "https://docs.oracle.com/en/database/oracle/oracle-database/19/cncpt/transactions.html",
        "https://docs.oracle.com/en/database/oracle/oracle-database/19/cncpt/data-concurrency-and-consistency.html",
        "https://docs.oracle.com/en/database/oracle/oracle-database/19/cncpt/physical-storage-structures.html",
        "https://docs.oracle.com/en/database/oracle/oracle-database/19/cncpt/indexes-and-index-organized-tables.html",
        "https://docs.oracle.com/en/database/oracle/oracle-database/19/bradv/index.html"
      ]
    },
    "mysql": {
      "version": "MySQL 8.4 LTS, InnoDB",
      "urls": [
        "https://dev.mysql.com/doc/refman/8.4/en/innodb-storage-engine.html",
        "https://dev.mysql.com/doc/refman/8.4/en/innodb-multi-versioning.html",
        "https://dev.mysql.com/doc/refman/8.4/en/innodb-locking.html",
        "https://dev.mysql.com/doc/refman/8.4/en/innodb-recovery.html",
        "https://dev.mysql.com/doc/refman/8.4/en/replication.html"
      ]
    },
    "clickhouse": {
      "version": "ClickHouse 25.8, семантика MergeTree; документация rolling",
      "urls": [
        "https://clickhouse.com/docs/engines/table-engines/mergetree-family/mergetree",
        "https://clickhouse.com/docs/engines/table-engines/mergetree-family/replacingmergetree",
        "https://clickhouse.com/docs/engines/table-engines/mergetree-family/aggregatingmergetree",
        "https://clickhouse.com/docs/engines/table-engines/integrations/kafka",
        "https://clickhouse.com/docs/sql-reference/statements/create/view#materialized-view",
        "https://clickhouse.com/docs/engines/table-engines/mergetree-family/replication"
      ]
    },
    "duckdb": {
      "version": "DuckDB 1.4.3, embedded native storage",
      "urls": [
        "https://duckdb.org/docs/1.4/connect/concurrency",
        "https://duckdb.org/docs/1.4/internals/storage",
        "https://duckdb.org/docs/1.4/guides/performance/indexing",
        "https://duckdb.org/docs/1.4/configuration/pragmas",
        "https://duckdb.org/docs/1.4/sql/statements/checkpoint"
      ]
    },
    "redis": {
      "version": "Redis Open Source 7.4; документация latest, без Redis 8-only функций",
      "urls": [
        "https://redis.io/docs/latest/develop/using-commands/transactions/",
        "https://redis.io/docs/latest/develop/programmability/eval-intro/",
        "https://redis.io/docs/latest/operate/oss_and_stack/management/persistence/",
        "https://redis.io/docs/latest/operate/oss_and_stack/management/replication/",
        "https://redis.io/docs/latest/operate/oss_and_stack/reference/cluster-spec/",
        "https://redis.io/docs/latest/develop/reference/eviction/"
      ]
    },
    "cassandra": {
      "version": "Apache Cassandra 5.0; stable documentation может обновляться",
      "urls": [
        "https://cassandra.apache.org/doc/stable/cassandra/architecture/storage-engine.html",
        "https://cassandra.apache.org/doc/stable/cassandra/architecture/dynamo.html",
        "https://cassandra.apache.org/doc/stable/cassandra/managing/operating/compaction/overview.html",
        "https://cassandra.apache.org/doc/stable/cassandra/managing/operating/compaction/tombstones.html",
        "https://cassandra.apache.org/doc/stable/cassandra/developing/cql/dml.html"
      ]
    },
    "scylladb": {
      "version": "ScyllaDB 2025.1; отдельно vnode keyspace и tablets",
      "urls": [
        "https://docs.scylladb.com/manual/branch-2025.1/features/lwt.html",
        "https://docs.scylladb.com/manual/branch-2025.1/cql/consistency.html",
        "https://docs.scylladb.com/manual/branch-2025.1/architecture/architecture-fault-tolerance.html",
        "https://docs.scylladb.com/manual/branch-2025.1/architecture/compaction/compaction-strategies.html",
        "https://www.scylladb.com/2025/04/08/announcing-scylladb-2025-1/"
      ]
    },
    "dynamodb": {
      "version": "DynamoDB API 2012-08-10; global tables 2019.11.21; проверено 2026-11-02",
      "urls": [
        "https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.ReadConsistency.html",
        "https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/transaction-apis.html",
        "https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/V2globaltables_HowItWorks.html",
        "https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/TTL.html",
        "https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/PointInTimeRecovery.html"
      ]
    },
    "mongodb": {
      "version": "MongoDB 8.0, WiredTiger",
      "urls": [
        "https://www.mongodb.com/docs/v8.0/core/wiredtiger/",
        "https://www.mongodb.com/docs/v8.0/core/transactions/",
        "https://www.mongodb.com/docs/v8.0/reference/read-concern-majority/",
        "https://www.mongodb.com/docs/v8.0/core/sharding-choose-a-shard-key/",
        "https://www.mongodb.com/docs/v8.0/core/index-ttl/"
      ]
    },
    "couchbase": {
      "version": "Couchbase Server 7.6; SDK transactions и edition проверять отдельно",
      "urls": [
        "https://docs.couchbase.com/server/7.6/learn/data/durability.html",
        "https://docs.couchbase.com/server/7.6/learn/data/transactions.html",
        "https://docs.couchbase.com/server/7.6/learn/buckets-memory-and-storage/storage-engines.html",
        "https://docs.couchbase.com/server/7.6/learn/clusters-and-availability/xdcr-overview.html",
        "https://docs.couchbase.com/server/7.6/n1ql/n1ql-intro/queriesandresults.html"
      ]
    },
    "elasticsearch": {
      "version": "Elasticsearch 8.19, не Serverless",
      "urls": [
        "https://www.elastic.co/guide/en/elasticsearch/reference/8.19/docs-replication.html",
        "https://www.elastic.co/guide/en/elasticsearch/reference/8.19/near-real-time.html",
        "https://www.elastic.co/guide/en/elasticsearch/reference/8.19/index-modules-translog.html",
        "https://www.elastic.co/guide/en/elasticsearch/reference/8.19/optimistic-concurrency-control.html",
        "https://www.elastic.co/guide/en/elasticsearch/reference/8.19/snapshot-restore.html"
      ]
    },
    "opensearch": {
      "version": "OpenSearch 2.19, self-managed",
      "urls": [
        "https://docs.opensearch.org/2.19/tuning-your-cluster/availability-and-recovery/segment-replication/index/",
        "https://docs.opensearch.org/2.19/api-reference/document-apis/index-document/",
        "https://docs.opensearch.org/2.19/tuning-your-cluster/availability-and-recovery/snapshots/snapshot-restore/",
        "https://docs.opensearch.org/2.19/im-plugin/ism/index/"
      ]
    },
    "timescaledb": {
      "version": "TimescaleDB 2.20.x на PostgreSQL 17; self-hosted, функции зависят от edition",
      "urls": [
        "https://docs.timescale.com/api/latest/hypertable/create_hypertable/",
        "https://docs.timescale.com/use-timescale/latest/continuous-aggregates/about-continuous-aggregates/",
        "https://docs.timescale.com/use-timescale/latest/data-retention/about-data-retention/",
        "https://github.com/timescale/timescaledb/releases/tag/2.20.0"
      ]
    },
    "object-storage": {
      "version": "Amazon S3 API: 2026-11-02; MinIO OSS RELEASE.2025-04-22T22-12-26Z, не AIStor",
      "urls": [
        "https://docs.aws.amazon.com/AmazonS3/latest/userguide/Welcome.html",
        "https://docs.aws.amazon.com/AmazonS3/latest/userguide/conditional-writes.html",
        "https://docs.aws.amazon.com/AmazonS3/latest/userguide/object-lock.html",
        "https://github.com/minio/minio/tree/RELEASE.2025-04-22T22-12-26Z",
        "https://github.com/minio/minio/blob/RELEASE.2025-04-22T22-12-26Z/docs/erasure/README.md"
      ]
    },
    "iceberg": {
      "version": "Apache Iceberg 1.9.2; format v2, engine/catalog отдельно",
      "urls": [
        "https://iceberg.apache.org/docs/1.9.2/reliability/",
        "https://iceberg.apache.org/docs/1.9.2/evolution/",
        "https://iceberg.apache.org/docs/1.9.2/maintenance/",
        "https://iceberg.apache.org/spec/",
        "https://github.com/apache/iceberg/releases/tag/apache-iceberg-1.9.2"
      ]
    },
    "delta-lake": {
      "version": "Delta Lake OSS 3.3.x; Spark 3.5, protocol/features отдельно",
      "urls": [
        "https://docs.delta.io/concurrency-control/",
        "https://docs.delta.io/delta-batch/",
        "https://docs.delta.io/delta-utility/",
        "https://docs.delta.io/delta-change-data-feed/",
        "https://github.com/delta-io/delta/releases/tag/v3.3.0",
        "https://docs.delta.io/delta-storage/"
      ]
    },
    "hudi": {
      "version": "Apache Hudi 1.0.2; Spark/Flink bundle должен соответствовать движку",
      "urls": [
        "https://hudi.apache.org/docs/1.0.2/table_types/",
        "https://hudi.apache.org/docs/1.0.2/concurrency_control/",
        "https://hudi.apache.org/docs/1.0.2/cleaning/",
        "https://hudi.apache.org/docs/1.0.2/record_merger/",
        "https://hudi.apache.org/docs/1.0.2/indexes/"
      ]
    }
  }
}