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+# Subissue Draft for #1525-01: Add DB Compatibility Matrix
+
+## Goal
+
+Establish a compatibility matrix that exercises persistence-layer tests across supported database
+versions before any refactoring begins.
+
+## Why First
+
+The later refactors change persistence architecture, async behavior, schema setup, and backend
+implementations. Running the tests against multiple database versions first gives a baseline to
+detect regressions early and narrows review scope to behavior rather than guesswork.
+
+## Scope
+
+- Bash is acceptable for low-complexity orchestration.
+- Focus only on the database compatibility matrix; end-to-end real-client testing is covered by
+  subissue #1525-02.
+
+## Testing Principles
+
+The implementation must follow these quality rules for all new and modified tests.
+
+- **Isolation**: Each test run must be independent. Tests that spin up database containers via
+  `testcontainers` already get their own ephemeral container; the bash matrix script achieves
+  isolation by running one matrix cell at a time in a fresh process, each with an exclusively
+  allocated container.
+- **Independent system resources**: Tests must not hard-code host ports. `testcontainers` binds
+  containers to random free host ports automatically — do not override this with fixed bindings.
+  Temporary files or directories, if needed, must be created under a `tempfile`-managed path so
+  they are always removed on exit.
+- **Cleanup**: After each test (success or failure) all containers, volumes, and temporary files
+  must be released. `testcontainers` handles containers automatically when the handle is dropped;
+  ensure `Drop` is not suppressed.
+- **Behavior, not implementation**: Tests must assert observable outcomes (e.g. the driver
+  correctly inserts and retrieves a torrent entry) rather than internal state (e.g. a specific SQL
+  query was issued).
+- **Verified before done**: No test is considered complete until it has been executed and passes
+  in a clean environment. Include confirmation of a passing run in the PR description.
+
+## Reference QA Workflow
+
+The PR #1695 review branch includes a QA script that defines the expected behavior:
+
+- `run-db-compatibility-matrix.sh`:
+  executes a compatibility matrix across SQLite, multiple MySQL versions, and multiple PostgreSQL
+  versions.
+
+This should be treated as a reference prototype, not a production artifact. The goal is to
+re-implement it in a form that integrates with the repository's normal test strategy.
+
+## Dependency Note
+
+PostgreSQL is not implemented yet, so this subissue cannot require successful execution against
+PostgreSQL. The structure should make it easy to add PostgreSQL combinations in subissue
+`#1525-08` once the driver exists.
+
+## Proposed Branch
+
+- `1525-01-db-compatibility-matrix`
+
+## Tasks
+
+### 1) Port the compatibility matrix workflow
+
+Add a low-complexity bash compatibility-matrix runner that exercises persistence-related tests
+across supported database versions.
+
+Tests to orchestrate:
+
+- `cargo check --workspace --all-targets`
+- configuration coverage for PostgreSQL connection settings
+- large-download counter saturation tests in the HTTP protocol layer
+- large-download counter saturation tests in the UDP protocol layer
+- SQLite driver tests
+- MySQL driver tests across selected MySQL versions
+
+Note: PostgreSQL version-matrix execution is deferred to subissue #1525-08, once the
+PostgreSQL driver exists.
+
+Steps:
+
+- Modify current DB driver tests so the DB image version can be injected through environment
+  variables:
+  - MySQL: `TORRUST_TRACKER_CORE_MYSQL_DRIVER_IMAGE_TAG`
+  - PostgreSQL (reserved for subissue #1525-08): `TORRUST_TRACKER_CORE_POSTGRES_DRIVER_IMAGE_TAG`
+
+  When `TORRUST_TRACKER_CORE_MYSQL_DRIVER_IMAGE_TAG` is not set, the test falls back to the
+  current hardcoded default (e.g. `8.0`), preserving existing behavior. The matrix script sets
+  this variable explicitly for each version in the loop, so unset means "run as today" and the
+  matrix just expands that into multiple combinations.
+
+- Add `contrib/dev-tools/qa/run-db-compatibility-matrix.sh` modeled after the PR prototype:
+  - `set -euo pipefail`
+  - define default version sets from env vars:
+    - `MYSQL_VERSIONS` defaulting to at least `8.0 8.4`
+    - `POSTGRES_VERSIONS` reserved for subissue #1525-08
+  - run pre-checks once (`cargo check --workspace --all-targets`)
+  - run protocol/configuration tests once
+  - run SQLite driver tests once
+  - loop MySQL versions: `docker pull mysql:<version>`, then run MySQL driver tests with
+    `TORRUST_TRACKER_CORE_RUN_MYSQL_DRIVER_TEST=1` and
+    `TORRUST_TRACKER_CORE_MYSQL_DRIVER_IMAGE_TAG=<version>`
+  - print a clear heading for each backend/version before executing tests
+  - fail fast on first failure with the failing backend/version visible in logs
+  - keep script complexity intentionally low; avoid re-implementing test logic already in test
+    functions
+- Replace the current single MySQL `database` step in `.github/workflows/testing.yaml` with
+  execution of the new script.
+
+Acceptance criteria:
+
+- [ ] DB image version injection is supported via `TORRUST_TRACKER_CORE_MYSQL_DRIVER_IMAGE_TAG`
+      (and a reserved `POSTGRES` equivalent for subissue #1525-08).
+- [ ] `contrib/dev-tools/qa/run-db-compatibility-matrix.sh` exists and runs successfully.
+- [ ] The script exercises SQLite and at least two MySQL versions by default.
+- [ ] Failures identify the backend/version combination that broke.
+- [ ] The `database` job step in `.github/workflows/testing.yaml` runs the matrix script instead
+      of a single-version MySQL command.
+- [ ] The script structure allows PostgreSQL to be added in subissue #1525-08 without a redesign.
+- [ ] Tests do not hard-code host ports; `testcontainers` assigns random ports automatically.
+- [ ] All containers started by tests are removed unconditionally on test completion or failure.
+
+### 2) Document the workflow
+
+Steps:
+
+- Document the local invocation command for the matrix script.
+- Document that the CI `database` step runs the same script.
+
+Acceptance criteria:
+
+- [ ] The matrix script is documented and runnable without ad hoc manual steps.
+
+## Out of Scope
+
+- qBittorrent end-to-end testing (covered by subissue #1525-02).
+- Adding PostgreSQL support itself.
+- Refactoring the production persistence interfaces.
+- Performance benchmarking, before/after comparison, and benchmark reporting.
+
+## Definition of Done
+
+- [ ] `cargo test --workspace --all-targets` passes.
+- [ ] `linter all` exits with code `0`.
+- [ ] The matrix script has been executed successfully in a clean environment; a passing run log
+      is included in the PR description.
+
+## References
+
+- EPIC: #1525
+- Reference PR: #1695
+- Reference implementation branch: `josecelano:pr-1684-review` — see EPIC for checkout
+  instructions (`docs/issues/1525-overhaul-persistence.md`)
+- Reference script: `contrib/dev-tools/qa/run-db-compatibility-matrix.sh`
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+# Subissue Draft for #1525-02: Add qBittorrent End-to-End Test
+
+## Goal
+
+Add a high-level end-to-end test that validates tracker behavior through a complete torrent-sharing
+scenario using real containerized BitTorrent clients, covering scenarios that lower-level unit and
+integration tests cannot reach.
+
+## Why Before the Refactor
+
+The persistence refactor changes storage behavior underneath the tracker. Having a real-client
+scenario that exercises a full download cycle (seeder uploads → leecher downloads → tracker
+records completion) gives a regression backstop that is not possible with protocol-level tests
+alone.
+
+## Scope
+
+- Follow the same pattern as the existing `e2e_tests_runner` binary
+  (`src/console/ci/e2e/runner.rs`): a Rust binary that drives the whole scenario using
+  `std::process::Command` to invoke `docker compose` and any container-side commands.
+- Use SQLite as the database backend; database compatibility across multiple versions is already
+  covered by subissue #1525-01.
+- Cover one complete scenario: a seeder sharing a torrent that a leecher downloads in full.
+- The binary is responsible for scaffolding (generating a temporary config and torrent file),
+  starting the services, sending commands into the qBittorrent containers (via their WebUI API
+  or `docker exec`), polling for completion, asserting the result, and tearing down.
+- Do not re-test things already covered at a lower level: announce parsing, scrape format,
+  whitelist/key logic, or multi-database compatibility.
+
+## Testing Principles
+
+The implementation must follow these quality rules.
+
+- **Isolation**: Each run of the E2E binary must be isolated from any other concurrently running
+  instance. Achieve this by using a unique Docker Compose project name per run (e.g.
+  `--project-name qbt-e2e-<random-suffix>`) so container names, networks, and volumes never
+  collide with a parallel run.
+- **Independent system resources**: Do not bind services to fixed host ports. Let Docker assign
+  ephemeral host ports and discover them from the compose output, so two simultaneous runs cannot
+  conflict. Place all temporary files (tracker config, payload, `.torrent` file) in a
+  `tempfile`-managed directory created at runner start and deleted on exit.
+- **Cleanup**: `docker compose down --volumes` must be called unconditionally — on success, on
+  assertion failure, and on panic. Use a Rust `Drop` guard or equivalent to guarantee teardown
+  even when the runner exits unexpectedly.
+- **Mock time when possible**: Use a configurable timeout (CLI argument or env var) for the
+  leecher-completion poll rather than a hard-coded sleep. If any logic depends on wall-clock time
+  (e.g. stale peer detection), inject a mockable clock consistent with the `clock` package used
+  elsewhere in the codebase.
+- **Behavior, not implementation**: Assert the outcome the user cares about — the leecher holds a
+  complete, byte-identical copy of the payload — not which internal tracker counters changed or
+  which announce endpoints were called.
+- **Verified before done**: The binary must be executed end-to-end and produce a passing result in
+  a clean environment before the subissue is closed. Include a run log in the PR description.
+
+## Reference QA Workflow
+
+`contrib/dev-tools/qa/run-qbittorrent-e2e.py` in the PR #1695 review branch demonstrates the
+scenario (seeder + leecher + tracker via Python subprocess). Treat it as a behavioral reference
+only; the implementation here will use `docker compose` instead of manual container management.
+
+## Proposed Branch
+
+- `1525-02-qbittorrent-e2e`
+
+## Tasks
+
+### 1) Add a docker compose file for the E2E scenario
+
+Add a compose file (e.g., `compose.qbittorrent-e2e.yaml`) that defines:
+
+- the tracker service configured with SQLite
+- a qbittorrent-seeder container
+- a qbittorrent-leecher container
+
+Steps:
+
+- Define a tracker service mounting a SQLite config file (generated by the runner).
+- Define seeder and leecher services using a suitable qBittorrent image.
+- Configure a shared network so all containers can reach each other and the tracker.
+- Define any volumes needed to mount the payload and torrent file into each client container.
+- Ensure `docker compose up --wait` exits cleanly when services are healthy.
+- Ensure `docker compose down --volumes` removes all containers and volumes.
+
+Acceptance criteria:
+
+- [ ] `docker compose -f compose.qbittorrent-e2e.yaml up --wait` starts all services without error.
+- [ ] `docker compose -f compose.qbittorrent-e2e.yaml down --volumes` leaves no orphaned resources.
+
+### 2) Implement the Rust runner binary
+
+Add a new binary (e.g., `src/bin/qbittorrent_e2e_runner.rs`) that follows the same structure as
+`src/console/ci/e2e/runner.rs`:
+
+- Parses CLI arguments or environment variables (compose file path, payload size, timeout).
+- Generates scaffolding: a temporary tracker config (SQLite) and a small deterministic payload
+  with its `.torrent` file.
+- Calls `docker compose up` via `std::process::Command`.
+- Seeds the payload: injects the torrent and payload into the seeder container via the qBittorrent
+  WebUI REST API (or `docker exec` as a fallback) and starts seeding.
+- Leaches the payload: injects the `.torrent` file into the leecher container and starts
+  downloading.
+- Polls for completion: queries the leecher's WebUI API until the torrent state reaches
+  `uploading` (100 % downloaded) or a timeout expires.
+- Asserts payload integrity: compares the downloaded file against the original (hash or byte
+  comparison).
+- Calls `docker compose down --volumes` unconditionally (even on assertion failure), mirroring
+  the cleanup pattern in `tracker_container.rs`.
+
+Steps:
+
+- Add a shared `docker compose` wrapper at `src/console/ci/compose.rs` (see below). This
+  module is not specific to qBittorrent and is reused by the benchmark runner in subissue
+  `#1525-03`.
+- Add a `qbittorrent` module under `src/console/ci/` (parallel to `e2e/`) containing:
+  - `runner.rs` — main orchestration logic
+  - `qbittorrent_client.rs` — HTTP calls to the qBittorrent WebUI API
+- **`src/console/ci/compose.rs` wrapper** — mirrors `docker.rs` but targets `docker compose`
+  subcommands. Design it around a `DockerCompose` struct that holds the compose file path and
+  project name:
+  - `DockerCompose::new(file: &Path, project: &str) -> Self`
+  - `up(&self) -> io::Result<()>` — runs `docker compose -f <file> -p <project> up --wait --detach`
+  - `down(&self) -> io::Result<()>` — runs `docker compose -f <file> -p <project> down --volumes`
+  - `port(&self, service: &str, container_port: u16) -> io::Result<u16>` — runs
+    `docker compose -f <file> -p <project> port <service> <port>` and parses the host port so
+    the runner never hard-codes ports
+  - `exec(&self, service: &str, cmd: &[&str]) -> io::Result<Output>` — wraps
+    `docker compose -f <file> -p <project> exec <service> <cmd…>` for injecting commands into
+    running containers
+  - Implement `Drop` on a `RunningCompose` guard returned by `up` that calls `down`
+    unconditionally, matching the `RunningContainer::drop` pattern in `docker.rs`
+  - Use `tracing` for progress output consistent with the rest of the runner
+- Generate a fixed small payload (e.g., 1 MiB of deterministic bytes) at runtime; store the
+  `.torrent` file in a `tempfile` directory so it is cleaned up automatically.
+- Re-use `tracing` for progress output, consistent with the existing runner.
+
+Acceptance criteria:
+
+- [ ] The runner completes a full seeder → leecher download using the containerized tracker.
+- [ ] Payload integrity is verified after download (hash or byte comparison).
+- [ ] The runner can be executed repeatedly without manual setup or teardown.
+- [ ] No orphaned containers or volumes remain on success or failure.
+- [ ] The binary is documented in the top-level module doc comment with an example invocation.
+- [ ] Each invocation uses a unique compose project name so parallel runs do not conflict.
+- [ ] All temporary files are placed in a managed temp directory and deleted on exit.
+- [ ] No fixed host ports are used; ports are discovered dynamically from the compose output.
+- [ ] `docker compose down --volumes` is called unconditionally via a `Drop` guard.
+
+### 3) Document the E2E workflow
+
+Steps:
+
+- Document the local invocation command (e.g., `cargo run --bin qbittorrent_e2e_runner`).
+- Document any prerequisites (Docker, image availability, open ports).
+- Clarify that this test is not run in the standard `cargo test` suite due to resource
+  requirements and describe how it is triggered in CI (opt-in env var or separate job).
+
+Acceptance criteria:
+
+- [ ] The test is documented and runnable without ad hoc manual steps.
+
+## Out of Scope
+
+- Testing multiple database backends (covered by subissue #1525-01).
+- Testing announce or scrape protocol correctness at the protocol level.
+- UDP tracker E2E (can be added later without redesigning the compose setup).
+
+## Definition of Done
+
+- [ ] `cargo test --workspace --all-targets` passes (or the E2E test is explicitly excluded with a
+      documented opt-in flag).
+- [ ] `linter all` exits with code `0`.
+- [ ] The E2E runner has been executed successfully in a clean environment; a passing run log is
+      included in the PR description.
+
+## References
+
+- EPIC: #1525
+- Reference PR: #1695
+- Reference implementation branch: `josecelano:pr-1684-review` — see EPIC for checkout
+  instructions (`docs/issues/1525-overhaul-persistence.md`)
+- Reference script: `contrib/dev-tools/qa/run-qbittorrent-e2e.py`
+- Existing runner pattern: `src/console/ci/e2e/runner.rs`
+- Docker command wrapper: `src/console/ci/e2e/docker.rs`
+- Existing container wrapper patterns: `src/console/ci/e2e/tracker_container.rs`