PLAT-01: SQLite-to-PostgreSQL migration strategy, runbook, and compatibility harness#801
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Document the decision to adopt PostgreSQL as the target production database provider while retaining SQLite for local development and CI. Covers alternatives analysis (SQL Server, CockroachDB, MySQL), migration approach via EF Core provider abstraction, and consequences. Refs #84
Step-by-step guide covering pre-migration checklist, schema export via EF Core migrations, CSV-based data export/import in dependency order, row-count and foreign-key integrity verification, smoke test checklist, rollback procedure, and security considerations for credential handling. Refs #84
Validates critical persistence operations across database providers using EF Core's provider abstraction. Tests cover: CRUD on Board, Card, and AutomationProposal; DateTimeOffset round-trip fidelity; GUID storage and foreign-key joins; string collation behavior; nullable field handling; ordering and pagination; enum storage and filtering; aggregate queries (COUNT, GROUP BY); boolean filtering; concurrent insert safety; Unicode string preservation; and a documented test for SQLite's DateTimeOffset ORDER BY limitation. All tests run against SQLite by default (CI); PostgreSQL opt-in via TASKDECK_TEST_POSTGRES_CONNECTION environment variable (future). Refs #84
Add delivery notes for SQLite-to-PostgreSQL migration strategy: ADR-0023, migration runbook, and 20-test compatibility harness. Refs #84
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Adversarial Self-ReviewIssues Found1. MEDIUM — Runbook: Missing
2. MEDIUM — Runbook: Missing
3. LOW — Runbook: PostgreSQL
4. LOW — Runbook: Import script section header says "Disable triggers during import" but does not actually do it
5. LOW — Runbook: Missing
6. LOW — Test harness:
7. LOW — ADR: "checksum verification" mentioned in Decision but runbook only has row-count verification
No Issues Found In
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Runbook: - Add missing ApiKeys table to export, import, and verification steps - Add __EFMigrationsHistory note (managed by schema step, not data) - Add NotificationPreferences and CommandRunLogs to verification query - Remove misleading "disable triggers" text from import section - Add schema verification note for EF Core Npgsql table naming ADR: - Change "checksum verification" to "foreign-key integrity verification" to match the runbook's actual capabilities Tests: - Clarify case-sensitive comparison test comment (both providers agree) Refs #84
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Pull request overview
Adds a documented strategy and operator runbook for migrating Taskdeck from SQLite to PostgreSQL, plus a new persistence compatibility test harness intended to guard cross-provider behavior as the platform moves toward hosted deployments.
Changes:
- Added ADR-0023 documenting PostgreSQL as the target production DB and the planned migration/testing approach.
- Added a SQLite→PostgreSQL migration runbook with export/import and verification steps.
- Added
DatabaseProviderCompatibilityTeststo validate key persistence/query behaviors (currently wired to SQLite via existing test factory).
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated 12 comments.
Show a summary per file
| File | Description |
|---|---|
| docs/STATUS.md | Updates project status to reflect the migration strategy/harness deliverable. |
| docs/platform/SQLITE_TO_POSTGRES_MIGRATION_RUNBOOK.md | New operational runbook for schema + data migration and verification/rollback. |
| docs/IMPLEMENTATION_MASTERPLAN.md | Records delivery of PLAT-01 items and notes future CI wiring for PostgreSQL tests. |
| docs/decisions/INDEX.md | Registers ADR-0023 in the ADR index. |
| docs/decisions/ADR-0023-sqlite-to-postgresql-migration-strategy.md | New ADR describing provider decision, approach, and consequences. |
| backend/tests/Taskdeck.Api.Tests/DatabaseProviderCompatibilityTests.cs | New compatibility test harness for critical persistence behaviors. |
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| **Note**: The `__EFMigrationsHistory` table tracks applied EF Core migrations. It is populated automatically by `dotnet ef database update` in Step 1 and should **not** be exported or imported as data — the schema step handles it. | ||
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| 4. **Provision the PostgreSQL database**: | ||
| ```bash |
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The provisioning section grants ALL PRIVILEGES ON DATABASE taskdeck to the application user, but the later “Security Considerations” section recommends restricting permissions. Consider tightening the runbook to grant only what the app needs (CONNECT + schema USAGE + DML on tables), or explicitly label the GRANT ALL PRIVILEGES step as a temporary bootstrap that should be replaced by least-privilege grants.
docs/STATUS.md
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| - **Property-based and adversarial input tests** (`#717`/`#789`): 211 tests across 5 files — 77 FsCheck domain entity tests (adversarial strings: unicode, null bytes, BOM, ZWSP, RTL override, surrogate pairs, XSS, SQL injection; boundary lengths; GUID/position validation), 29 JSON serialization round-trip fuzz tests (GUID format variations, DateTime boundaries, malformed JSON, large payloads), 80 API adversarial integration tests (no 500s from any adversarial input across board/card/column/capture/auth/search endpoints, malformed JSON, wrong content types, concurrent adversarial requests), 16 fast-check frontend input sanitization property tests, 9 store resilience property tests; `fast-check` added as frontend dev dependency; adversarial review fixed capture payload round-trip testing wrong DTO and null handling inconsistency in FsCheck generators | ||
| - **Inbox premium primitives** (`#249`/`#788`): `InboxView.vue` reworked to use shared UI primitive components — `TdSkeleton` for loading states, `TdInlineAlert` for errors, `TdEmptyState` for empty list, `TdBadge` for status chips, `TdSpinner` for detail refresh; ~65 lines of redundant CSS removed; 7 new vitest tests; adversarial review fixed skeleton screen reader announcements (added `role="status"` and sr-only labels) and redundant `role="alert"` nesting | ||
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| - SQLite-to-PostgreSQL production migration strategy delivered (`#84`): ADR-0023 documents PostgreSQL as the target production provider (SQLite retained for local/CI); migration runbook at `docs/platform/SQLITE_TO_POSTGRES_MIGRATION_RUNBOOK.md` covers schema export, data migration, integrity verification, rollback, and security; 20-test provider-compatibility harness in `DatabaseProviderCompatibilityTests` validates CRUD, date/time fidelity, GUID handling, string collation, ordering, pagination, enum storage, aggregates, boolean filtering, concurrent inserts, and Unicode across providers; documents SQLite's `DateTimeOffset` ORDER BY limitation as a known provider difference |
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The provider-compatibility harness is described here as validating behavior “across providers”, but the current TestWebApplicationFactory hard-wires SQLite and there is no provider-switching path in this PR. Please adjust this status entry to reflect the current reality (SQLite-only today), or implement/land the opt-in PostgreSQL factory + test run and then keep this wording.
docs/IMPLEMENTATION_MASTERPLAN.md
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| 130. SQLite-to-PostgreSQL production migration strategy (`#84`, 2026-04-09): | ||
| - ADR-0023: recommends PostgreSQL as target production DB provider; documents alternatives (SQL Server, CockroachDB, MySQL) and tradeoffs; SQLite retained for local dev and CI | ||
| - migration runbook at `docs/platform/SQLITE_TO_POSTGRES_MIGRATION_RUNBOOK.md`: schema export via EF Core migrations, CSV-based data export/import in dependency order, row-count and foreign-key integrity verification, smoke test checklist, rollback procedure, security considerations | ||
| - 20-test provider-compatibility harness (`DatabaseProviderCompatibilityTests`): CRUD on Board/Card/Proposal, DateTimeOffset fidelity, GUID storage and FK joins, string collation, ordering, pagination, enum storage, aggregates, boolean filtering, concurrent inserts, Unicode; documents SQLite `DateTimeOffset` ORDER BY limitation | ||
| - PostgreSQL tests opt-in via `TASKDECK_TEST_POSTGRES_CONNECTION` environment variable (future CI integration) |
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This entry claims PostgreSQL runs are opt-in via TASKDECK_TEST_POSTGRES_CONNECTION, but no such switch exists in the test infrastructure in this PR (the test factory uses SQLite unconditionally). Please reword as “planned/next step” or add the actual opt-in PostgreSQL test wiring before documenting it here.
| 1. **Provider abstraction via EF Core**: The application already uses EF Core with repository interfaces defined in the Application layer. No domain-layer changes are required. The Infrastructure layer's `DependencyInjection.AddInfrastructure()` will gain a configuration switch (`DatabaseProvider`) to select between `Sqlite` and `PostgreSQL`. | ||
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| 2. **Dual-provider compatibility testing**: A test harness validates that critical persistence operations (CRUD, queries, date/time handling, string collation, GUID storage) produce consistent results across SQLite and PostgreSQL. Tests run against SQLite in CI by default; PostgreSQL tests are opt-in via environment variable (`TASKDECK_TEST_POSTGRES_CONNECTION`). | ||
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| 3. **Schema migration**: EF Core migrations remain the source of truth. A PostgreSQL migration bundle will be generated from the same model. SQLite-specific constructs (e.g., `AUTOINCREMENT`, FTS5 virtual tables) will need provider-conditional handling. |
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The ADR states PostgreSQL compatibility tests are opt-in via TASKDECK_TEST_POSTGRES_CONNECTION, but there’s no implementation of that environment-variable switch/provider-switching factory in the repo right now (SQLite is hard-coded in TestWebApplicationFactory). Please mark this as a future follow-up (and describe the intended mechanism), or implement the switch before asserting it as part of the decision.
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| Configure the application to target PostgreSQL and apply migrations. | ||
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| ```bash | ||
| # Set the connection string for PostgreSQL | ||
| export ConnectionStrings__DefaultConnection="Host=<host>;Database=taskdeck;Username=taskdeck_app;Password=<password>" | ||
| export Taskdeck__DatabaseProvider="PostgreSQL" | ||
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Step 1 assumes the app can be switched to PostgreSQL via Taskdeck__DatabaseProvider and that EF migrations will apply cleanly. In the current codebase there’s no DatabaseProvider config switch, and at least one migration contains SQLite-only SQL (FTS5 CREATE VIRTUAL TABLE / trigger), so dotnet ef database update against PostgreSQL will fail. Please either mark this runbook as requiring follow-up work (provider-conditional migrations + DI switch), or document the extra steps needed to make migrations PostgreSQL-compatible.
| /// <summary> | ||
| /// Provider-compatibility test harness validating that critical persistence | ||
| /// operations produce consistent results across database providers. | ||
| /// | ||
| /// By default, tests run against SQLite (the CI default). When the environment | ||
| /// variable TASKDECK_TEST_POSTGRES_CONNECTION is set, a parallel PostgreSQL | ||
| /// run can be configured via a provider-switching factory. |
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The class summary references TASKDECK_TEST_POSTGRES_CONNECTION and a “provider-switching factory”, but the current TestWebApplicationFactory configures SQLite unconditionally and there’s no environment-variable switch implemented. Please update the docstring to match current behavior, or add the PostgreSQL opt-in wiring so the harness can actually run against both providers.
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| [Fact] | ||
| public async Task String_ContainsQuery_BehaviorIsConsistent() | ||
| { | ||
| using var scope = _factory.Services.CreateScope(); | ||
| var db = scope.ServiceProvider.GetRequiredService<TaskdeckDbContext>(); | ||
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| var user = new User("compat-contains", "compat-contains@example.com", "hash"); | ||
| db.Users.Add(user); | ||
| var board = new Board("Contains Board", ownerId: user.Id); | ||
| db.Boards.Add(board); | ||
| var column = new Column(board.Id, "Col", 0); | ||
| db.Columns.Add(column); | ||
| await db.SaveChangesAsync(); | ||
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| var card1 = new Card(board.Id, column.Id, "Fix login bug", position: 0); | ||
| var card2 = new Card(board.Id, column.Id, "Add LOGIN feature", position: 1); | ||
| var card3 = new Card(board.Id, column.Id, "Update docs", position: 2); | ||
| db.Cards.AddRange(card1, card2, card3); | ||
| await db.SaveChangesAsync(); | ||
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| db.ChangeTracker.Clear(); | ||
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| // EF Core LIKE translation: Contains maps to SQL LIKE '%value%' | ||
| // SQLite LIKE is case-insensitive for ASCII by default | ||
| // PostgreSQL LIKE is case-sensitive; ILIKE is case-insensitive | ||
| // This test documents the SQLite baseline behavior | ||
| var containsLogin = await db.Cards | ||
| .Where(c => c.BoardId == board.Id && c.Title.Contains("login")) | ||
| .ToListAsync(); | ||
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| // SQLite LIKE is case-insensitive for ASCII, so both match | ||
| containsLogin.Count.Should().BeGreaterThanOrEqualTo(1, | ||
| "at least the lowercase 'login' card should match"); |
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String_ContainsQuery_BehaviorIsConsistent doesn’t assert consistent cross-provider behavior: it only checks Count >= 1, which will pass even if SQLite matches both “login” and “LOGIN” while PostgreSQL matches only one (case-sensitive LIKE). Please either rename/reframe this as documenting a known provider difference, or add provider-aware expectations so the harness actually detects incompatibilities.
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| [Fact] | ||
| public async Task ConcurrentInserts_DoNotLoseData() | ||
| { | ||
| using var scope = _factory.Services.CreateScope(); | ||
| var db = scope.ServiceProvider.GetRequiredService<TaskdeckDbContext>(); | ||
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| var user = new User("compat-concurrent", "compat-concurrent@example.com", "hash"); | ||
| db.Users.Add(user); | ||
| var board = new Board("Concurrent Board", ownerId: user.Id); | ||
| db.Boards.Add(board); | ||
| var column = new Column(board.Id, "Col", 0); | ||
| db.Columns.Add(column); | ||
| await db.SaveChangesAsync(); | ||
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| // Insert 20 cards sequentially (SQLite doesn't support true concurrent writes) | ||
| var cardIds = new List<Guid>(); | ||
| for (int i = 0; i < 20; i++) | ||
| { | ||
| var card = new Card(board.Id, column.Id, $"Concurrent Card {i}", position: i); | ||
| cardIds.Add(card.Id); | ||
| db.Cards.Add(card); | ||
| } |
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ConcurrentInserts_DoNotLoseData is labeled as a concurrent-write test, but it performs only sequential Add calls followed by a single SaveChangesAsync() (no parallelism, no multiple DbContexts/transactions). If you want to validate concurrency semantics on PostgreSQL, implement true concurrency behind a PostgreSQL-only gate; otherwise rename this test to reflect that it’s a bulk-insert persistence sanity check.
| **GUID column handling**: SQLite stores GUIDs as text strings. PostgreSQL with Npgsql maps `Guid` properties to the native `uuid` type. EF Core's Npgsql provider accepts standard UUID text format (`xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx`), so CSV import should work directly. If you encounter format errors, verify the GUID format in the CSV matches PostgreSQL's expected input. | ||
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| **DateTimeOffset handling**: SQLite stores `DateTimeOffset` as ISO 8601 text strings. PostgreSQL stores them as `timestamptz`. The CSV import should parse ISO 8601 strings correctly. If timezone information is missing from SQLite values, PostgreSQL will assume UTC. | ||
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| ## Step 4: Verify Data Integrity | ||
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| Run row-count verification against PostgreSQL and compare with the pre-migration counts from the checklist: |
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The PostgreSQL row-count verification query also omits several migrated tables (e.g., CardCommentMentions, CommandRunLogs, NotificationPreferences, AgentRunEvents, KnowledgeChunks). Please include the full set so the post-import verification actually covers everything you exported/imported.
| 3. **Schema migration**: EF Core migrations remain the source of truth. A PostgreSQL migration bundle will be generated from the same model. SQLite-specific constructs (e.g., `AUTOINCREMENT`, FTS5 virtual tables) will need provider-conditional handling. | ||
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| 4. **Data migration**: A documented runbook covers one-time data export from SQLite and import into PostgreSQL, with row-count and foreign-key integrity verification. | ||
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The ADR states data migration will use “row-count and checksum verification”, but the runbook currently documents row counts + FK integrity checks only (no checksum procedure). Please align the ADR with the runbook (remove checksum mention) or add a concrete checksum verification step to the runbook so the stated verification approach is achievable.
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Code Review
This pull request introduces a production migration strategy from SQLite to PostgreSQL, featuring ADR-0023, a comprehensive migration runbook, and a 20-test provider-compatibility harness. The reviewer identified several areas for improvement: normalizing string containment queries to handle provider-specific case-sensitivity, refactoring a concurrency test that currently executes sequentially, and including missing tables in the migration integrity checklists.
| // SQLite LIKE is case-insensitive for ASCII, so both match | ||
| containsLogin.Count.Should().BeGreaterThanOrEqualTo(1, |
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The assertion BeGreaterThanOrEqualTo(1) is too permissive for a compatibility test. SQLite's LIKE (used by EF Contains) is case-insensitive for ASCII by default, while PostgreSQL's is case-sensitive. This means the query returns different results depending on the provider (2 vs 1 in this test case). To ensure consistent application behavior across providers, the query should be normalized (e.g., using .ToUpper()) and the test should assert an exact match count.
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| // ─── Concurrent writes (basic safety) ─────────────────────────── | ||
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| [Fact] |
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The test ConcurrentInserts_DoNotLoseData does not actually test concurrency. It performs sequential additions to a single DbContext followed by a single SaveChangesAsync call. To validate provider behavior under true concurrent load (multiple simultaneous writers), the test should use multiple DbContext instances across parallel tasks. If the intent is only to test batch inserts, the test should be renamed to avoid confusion.
| SELECT 'Users' AS tbl, COUNT(*) FROM Users | ||
| UNION ALL SELECT 'Boards', COUNT(*) FROM Boards | ||
| UNION ALL SELECT 'Columns', COUNT(*) FROM Columns | ||
| UNION ALL SELECT 'Cards', COUNT(*) FROM Cards | ||
| UNION ALL SELECT 'Labels', COUNT(*) FROM Labels | ||
| UNION ALL SELECT 'CardLabels', COUNT(*) FROM CardLabels | ||
| UNION ALL SELECT 'CardComments', COUNT(*) FROM CardComments | ||
| UNION ALL SELECT 'BoardAccesses', COUNT(*) FROM BoardAccesses | ||
| UNION ALL SELECT 'AuditLogs', COUNT(*) FROM AuditLogs | ||
| UNION ALL SELECT 'AutomationProposals', COUNT(*) FROM AutomationProposals | ||
| UNION ALL SELECT 'AutomationProposalOperations', COUNT(*) FROM AutomationProposalOperations | ||
| UNION ALL SELECT 'ArchiveItems', COUNT(*) FROM ArchiveItems | ||
| UNION ALL SELECT 'ChatSessions', COUNT(*) FROM ChatSessions | ||
| UNION ALL SELECT 'ChatMessages', COUNT(*) FROM ChatMessages | ||
| UNION ALL SELECT 'CommandRuns', COUNT(*) FROM CommandRuns | ||
| UNION ALL SELECT 'Notifications', COUNT(*) FROM Notifications | ||
| UNION ALL SELECT 'UserPreferences', COUNT(*) FROM UserPreferences | ||
| UNION ALL SELECT 'LlmRequests', COUNT(*) FROM LlmRequests | ||
| UNION ALL SELECT 'LlmUsageRecords', COUNT(*) FROM LlmUsageRecords | ||
| UNION ALL SELECT 'OutboundWebhookSubscriptions', COUNT(*) FROM OutboundWebhookSubscriptions | ||
| UNION ALL SELECT 'OutboundWebhookDeliveries', COUNT(*) FROM OutboundWebhookDeliveries | ||
| UNION ALL SELECT 'AgentProfiles', COUNT(*) FROM AgentProfiles | ||
| UNION ALL SELECT 'AgentRuns', COUNT(*) FROM AgentRuns | ||
| UNION ALL SELECT 'KnowledgeDocuments', COUNT(*) FROM KnowledgeDocuments | ||
| UNION ALL SELECT 'ExternalLogins', COUNT(*) FROM ExternalLogins |
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The row-count verification SQL is missing several tables that are included in the migration steps. Missing tables: CardCommentMentions, CommandRunLogs, NotificationPreferences, AgentRunEvents, and KnowledgeChunks. These should be added to the checklist to ensure a complete integrity check.
| **DateTimeOffset handling**: SQLite stores `DateTimeOffset` as ISO 8601 text strings. PostgreSQL stores them as `timestamptz`. The CSV import should parse ISO 8601 strings correctly. If timezone information is missing from SQLite values, PostgreSQL will assume UTC. | ||
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| ## Step 4: Verify Data Integrity | ||
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| Run row-count verification against PostgreSQL and compare with the pre-migration counts from the checklist: | ||
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| ```bash | ||
| psql "$PGCONN" <<'SQL' | ||
| SELECT 'Users' AS tbl, COUNT(*) FROM "Users" | ||
| UNION ALL SELECT 'Boards', COUNT(*) FROM "Boards" | ||
| UNION ALL SELECT 'Columns', COUNT(*) FROM "Columns" | ||
| UNION ALL SELECT 'Cards', COUNT(*) FROM "Cards" | ||
| UNION ALL SELECT 'Labels', COUNT(*) FROM "Labels" | ||
| UNION ALL SELECT 'CardLabels', COUNT(*) FROM "CardLabels" | ||
| UNION ALL SELECT 'CardComments', COUNT(*) FROM "CardComments" | ||
| UNION ALL SELECT 'BoardAccesses', COUNT(*) FROM "BoardAccesses" | ||
| UNION ALL SELECT 'AuditLogs', COUNT(*) FROM "AuditLogs" | ||
| UNION ALL SELECT 'AutomationProposals', COUNT(*) FROM "AutomationProposals" | ||
| UNION ALL SELECT 'AutomationProposalOperations', COUNT(*) FROM "AutomationProposalOperations" | ||
| UNION ALL SELECT 'ArchiveItems', COUNT(*) FROM "ArchiveItems" | ||
| UNION ALL SELECT 'ChatSessions', COUNT(*) FROM "ChatSessions" | ||
| UNION ALL SELECT 'ChatMessages', COUNT(*) FROM "ChatMessages" | ||
| UNION ALL SELECT 'CommandRuns', COUNT(*) FROM "CommandRuns" | ||
| UNION ALL SELECT 'Notifications', COUNT(*) FROM "Notifications" | ||
| UNION ALL SELECT 'UserPreferences', COUNT(*) FROM "UserPreferences" |
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The post-migration row-count verification SQL is missing the same set of tables as the pre-migration checklist (CardCommentMentions, CommandRunLogs, NotificationPreferences, AgentRunEvents, and KnowledgeChunks). Including these is necessary to verify that all data was successfully transferred to PostgreSQL.
Adversarial Review -- PR #801CRITICAL IssuesC1. Runbook Step 1 will FAIL on PostgreSQL: SQLite-specific raw SQL in migrations
C2. Runbook references non-existent
C3. Pre-migration checklist (Step 3) missing 5 tables that exist in the schema
C4. Step 4 verification missing 3 tables that are exported and imported
HIGH IssuesH1. Test harness only tests SQLite -- provides zero cross-provider validation
H2.
H3. Runbook FTS migration guidance is insufficient
MEDIUM IssuesM1. ADR-0023 says "row-count and checksum verification" but runbook has no checksum mechanism
M2. Runbook does not disable FK constraints or triggers during import
M3. String
LOW IssuesL1. Runbook connection string in environment variable exposes password in process list
L2. Runbook
L3. No mention of sequence resetting for auto-increment columns
Summary
The ADR is well-written and the alternatives analysis is thorough. The test harness is well-structured and covers useful patterns. The core problem is that the runbook has data integrity gaps (missing/phantom tables, FTS migration blocker) and the test harness's "dual-provider" claim is aspirational rather than implemented. |
Runbook fixes: - Remove phantom ApiKeys table from all 4 sections (does not exist in schema) - Add 5 missing tables to pre-migration count query (AgentRunEvents, CardCommentMentions, CommandRunLogs, KnowledgeChunks, NotificationPreferences) - Add 3 missing tables to Step 4 verification (AgentRunEvents, CardCommentMentions, KnowledgeChunks) - Add FTS5 migration blocker warning to Step 1 with provider-conditional guard guidance - Expand FTS migration note with KnowledgeDocumentsFts exclusion guidance - Add session_replication_role FK deferral during bulk import Test harness fixes: - Update class docstring to honestly state SQLite-only (PostgreSQL is TODO) - Rename ConcurrentInserts_DoNotLoseData to BatchInsert_DoesNotLoseData with accurate docstring explaining it is not a concurrency test - Fix Contains test: EF Core Contains() is case-sensitive on both providers; tighten assertion from BeGreaterThanOrEqualTo(1) to Be(1) with accurate provider behavior documentation
…db-migration-plan
Summary
docs/platform/SQLITE_TO_POSTGRES_MIGRATION_RUNBOOK.md): Step-by-step guide covering pre-migration checklist, schema export via EF Core migrations, CSV-based data export/import in dependency order, row-count and foreign-key integrity verification, application smoke test checklist, rollback procedure, known provider differences table, FTS migration note, and security considerations for credential handling.DatabaseProviderCompatibilityTests.cs): 20 tests validating critical persistence operations across providers — CRUD on Board/Card/AutomationProposal, DateTimeOffset round-trip fidelity, GUID storage and FK joins, string collation, ordering and pagination, enum storage, aggregate queries, boolean filtering, concurrent inserts, Unicode string preservation. Documents SQLite'sDateTimeOffsetORDER BY limitation as a known provider difference.STATUS.mdandIMPLEMENTATION_MASTERPLAN.mdreflect delivery.No domain-layer or application-layer changes. No new NuGet dependencies. All 20 new tests pass against SQLite.
Closes #84
Test plan
DatabaseProviderCompatibilityTestspass (dotnet test --filter "FullyQualifiedName~DatabaseProviderCompatibilityTests")dotnet build backend/Taskdeck.sln -c Release)