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+# Changelog
 
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+---
+
+## [1.0.0] - 2026-04-09
+
+### Added
+
+#### Base Entity Hierarchy
+- `BaseEntity<TKey>` / `BaseEntity` — strongly-typed primary key base class
+- `AuditableEntity<TKey>` / `AuditableEntity` — adds `CreatedAt`, `CreatedBy`, `UpdatedAt`, `UpdatedBy`
+- `SoftDeletableEntity<TKey>` / `SoftDeletableEntity` — adds `IsDeleted`, `DeletedAt`, `DeletedBy`
+- `FullEntity<TKey>` / `FullEntity` — soft-delete + audit + optimistic concurrency (`RowVersion`)
+
+#### Entity Configuration Bases
+- `BaseEntityConfiguration<TEntity, TKey>` — auto-configures primary key
+- `AuditableEntityConfiguration<TEntity, TKey>` — adds audit columns and `CreatedAt` index
+- `SoftDeletableEntityConfiguration<TEntity, TKey>` — adds `IsDeleted` default and composite index
+
+#### Interfaces
+- `IAuditable` — audit timestamp contract
+- `IFullAuditable` — field-level change history contract
+- `ISoftDeletable` — soft delete contract
+- `IConcurrencyAware` — optimistic concurrency contract
+- `IUserProvider` — current user resolution contract
+- `IRepository<T>` / `IReadRepository<T>` — repository contracts
+- `IUnitOfWork` — unit of work contract
+- `ISpecification<T>` / `ISpecification<T, TResult>` — specification pattern contracts
+
+#### Soft Delete
+- `SoftDeleteInterceptor` — intercepts `DELETE` and converts to `UPDATE SET IsDeleted = true`
+- Global query filter automatically excludes soft-deleted rows
+- `IncludeDeleted()` — bypass the filter to include soft-deleted rows
+- `OnlyDeleted()` — query only soft-deleted rows
+- `GetDeletedAsync()` — load all soft-deleted rows from a `DbSet<T>`
+- `Restore()` — clear soft-delete flags on an entity
+- `HardDelete()` — permanently remove a record bypassing the interceptor
+- Optional cascade soft delete for loaded navigation properties
+
+#### Audit Trail
+- `AuditInterceptor` — auto-stamps `CreatedAt`/`CreatedBy` on insert and `UpdatedAt`/`UpdatedBy` on update
+- Protects `CreatedAt` and `CreatedBy` from being overwritten on update
+- Optional full audit log (`IFullAuditable`) — records every field change in an `AuditLog` table
+
+#### Repository and Unit of Work
+- `Repository<T>` — generic implementation of `IRepository<T>` and `IReadRepository<T>`
+- `UnitOfWork<TContext>` — groups multiple repository operations into a single `SaveChangesAsync`
+- All registered automatically via `AddEfCoreExtensions`
+
+#### Specification Pattern
+- `Specification<T>` base class with `AddCriteria`, `AddInclude`, `ApplyOrderBy`, `ApplyPaging`, `ApplyAsNoTracking`, `ApplyAsSplitQuery`
+- `Specification<T, TResult>` — projecting specification with `ApplySelector`
+- `And()` / `Or()` combinators — compose specifications at runtime
+- `SpecificationBuilder<T>` — fluent inline builder for one-off queries
+- `ApplySpecification` extension — apply any spec to an `IQueryable<T>`
+- `ToListAsync(ISpecification<T, TResult>)` — project and materialise in one call
+- `ToPagedFromSpecAsync` — apply spec criteria then paginate
+
+#### Pagination
+- `ToPagedAsync` — offset pagination returning `PagedResult<T>` with full metadata
+- `SelectToPagedAsync` — project before materialising, then paginate
+- `ToKeysetPagedAsync` — keyset/cursor pagination returning `KeysetPagedResult<T>`
+- `PagedResult<T>.Map<TDestination>` — map items to a different type while preserving metadata
+
+#### Dynamic Filters and Sorting
+- `ApplyFilters(FilterDescriptor[])` — apply runtime filter arrays to any `IQueryable<T>`
+- Supported operators: `eq`, `ne`, `gt`, `gte`, `lt`, `lte`, `contains`, `startswith`, `endswith`, `isnull`, `isnotnull`, `in`, `between`
+- `ApplySorts(SortDescriptor[])` — apply runtime multi-column sorting
+- Dot-separated nested property paths supported in both filters and sorts
+
+#### Query Helpers
+- `GetByIdAsync` / `GetByIdOrThrowAsync` — single entity lookup by primary key
+- `GetByIdsAsync` — batch lookup translating to `WHERE key IN (...)`
+- `GetAllAsync` — load all rows from a `DbSet<T>`
+- `FindAsync` — load by predicate or specification
+- `ExistsAsync` — existence check by key or predicate
+- `WhereIf` / `WhereIfNotNull` / `WhereIfNotEmpty` — conditional filtering
+- `OrderByDynamic` / `ThenByDynamic` — sort by property name string
+- `SelectToListAsync` / `SelectFirstOrDefaultAsync` / `SelectDistinctAsync` — projection helpers
+- `WithNoTracking` — alias for `AsNoTracking`
+- `RemoveRangeAsync` — load and stage for deletion by predicate
+
+#### DbContext Utilities
+- `ExecuteInTransactionAsync` — wraps work in a transaction respecting EF Core execution strategy
+- `DetachAll` — clears all tracked entities from the change tracker
+- `TruncateAsync<T>` — truncates a table by entity type using EF Core metadata
+
+#### Slow Query Logging
+- `SlowQueryInterceptor` — logs a warning for any query exceeding a configurable threshold
+- Configured via `LogSlowQueries(TimeSpan threshold)`
+
+#### Structured Exceptions
+- `EfCoreException` — abstract base for all EfCoreKit exceptions
+- `EntityNotFoundException` — thrown by `GetByIdOrThrowAsync` and `RemoveByIdAsync`
+- `ConcurrencyConflictException` — thrown automatically on stale row-version conflict
+- `DuplicateEntityException` — throw manually when catching unique constraint violations
+- `InvalidFilterException` — thrown by `ApplyFilters` for invalid filter descriptors
+
+#### DI Registration
+- `AddEfCoreExtensions<TContext>` — single call registers DbContext, interceptors, repository, and unit of work
+- `EfCoreDbContext<TContext>` — optional base context that wires interceptors and query filters automatically