## Infrastructure Services: Knowledge, AI, Billing, Storage, Epub
Overview: Core infra services for semantic search, EPUB processing, storage, billing and platform integration. This document highlights interfaces, implementations, caching behavior and configuration (AiSettings, StripeSettings).

=== DIAGRAM 1: Dependency and Model Map (dependency-map) ===
```mermaid
---
config:
  flowchart:
    defaultRenderer: "elk"
---
flowchart TD
    flow_file_nexusreader_infrastructure_helpers_contenthasher_cs_file_1["ContentHasher"]
    flow_file_nexusreader_infrastructure_helpers_jsonrepairhelper_cs_file_1["JsonRepairHelper"]
    flow_file_nexusreader_infrastructure_services_billingservice_cs_file_1["BillingService"]
    flow_file_nexusreader_infrastructure_services_bookstorageservice_cs_file_1["BookStorageService"]
    flow_file_nexusreader_infrastructure_services_epubreaderservice_cs_file_1["EpubReaderService"]
    flow_file_nexusreader_infrastructure_services_knowledgeservice_cs_file_1["KnowledgeService"]
    flow_file_nexusreader_web_client_program_cs_file_1["Program.cs"]
    flow_file_nexusreader_infrastructure_identity_tokenlimithandler_cs_file_1["TokenLimitHandler"]
    flow_file_nexusreader_infrastructure_identity_tokenlimitrequirement_cs_file_1["TokenLimitRequirement"]
    flow_file_nexusreader_infrastructure_persistence_ebookrepository_cs_file_1["EbookRepository"]
    flow_file_nexusreader_web_client_handlers_authenticationheaderhandler_cs_file_1["AuthenticationHeaderHandler"]
    flow_type_nexusreader_infrastructure_identity_tokenlimitrequirement_cs_tokenlimitrequirement_8[/"TokenLimitRequirement"/]
    flow_type_nexusreader_infrastructure_persistence_ebookrepository_cs_ebookrepository_12[/"EbookRepository"/]
    flow_type_nexusreader_infrastructure_services_bookstorageservice_cs_bookstorageservice_10[/"BookStorageService"/]
    flow_type_nexusreader_web_client_handlers_authenticationheaderhandler_cs_authenticationheaderhandler_14[/"AuthenticationHeaderHandler"/]
    flow_type_nexusreader_web_client_program_cs_throwingbookstorageservice_74[/"ThrowingBookStorageService"/]
    flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61[/"ThrowingDbContextFactory"/]
    flow_type_nexusreader_web_client_program_cs_throwingebookrepository_84[/"ThrowingEbookRepository"/]
    flow_type_nexusreader_web_client_program_cs_throwingembeddinggenerator_66[/"ThrowingEmbeddingGenerator"/]
    flow_type_nexusreader_web_client_program_cs_throwingsyncbroadcaster_94[/"ThrowingSyncBroadcaster"/]
    flow_file_nexusreader_infrastructure_identity_tokenlimitrequirement_cs_file_1 -->|model TokenLimitRequirement| flow_type_nexusreader_infrastructure_identity_tokenlimitrequirement_cs_tokenlimitrequirement_8
    flow_file_nexusreader_infrastructure_persistence_ebookrepository_cs_file_1 -->|model EbookRepository| flow_type_nexusreader_infrastructure_persistence_ebookrepository_cs_ebookrepository_12
    flow_file_nexusreader_infrastructure_services_bookstorageservice_cs_file_1 -->|model BookStorageService| flow_type_nexusreader_infrastructure_services_bookstorageservice_cs_bookstorageservice_10
    flow_file_nexusreader_web_client_handlers_authenticationheaderhandler_cs_file_1 -->|model AuthenticationHeaderHandler| flow_type_nexusreader_web_client_handlers_authenticationheaderhandler_cs_authenticationheaderhandler_14
    flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingBookStorageService| flow_type_nexusreader_web_client_program_cs_throwingbookstorageservice_74
    flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingDbContextFactory| flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61
    flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingEbookRepository| flow_type_nexusreader_web_client_program_cs_throwingebookrepository_84
    flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingEmbeddingGenerator| flow_type_nexusreader_web_client_program_cs_throwingembeddinggenerator_66
    flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingSyncBroadcaster| flow_type_nexusreader_web_client_program_cs_throwingsyncbroadcaster_94
    click flow_file_nexusreader_infrastructure_identity_tokenlimithandler_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Identity/TokenLimitHandler.cs:1:1" "Open source"
    click flow_file_nexusreader_infrastructure_identity_tokenlimitrequirement_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Identity/TokenLimitRequirement.cs:1:1" "Open source"
    click flow_type_nexusreader_infrastructure_identity_tokenlimitrequirement_cs_tokenlimitrequirement_8 href "vscode://file/NexusReader.Infrastructure/Identity/TokenLimitRequirement.cs:8:1" "Open source"
    click flow_file_nexusreader_infrastructure_persistence_ebookrepository_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Persistence/EbookRepository.cs:1:1" "Open source"
    click flow_type_nexusreader_infrastructure_persistence_ebookrepository_cs_ebookrepository_12 href "vscode://file/NexusReader.Infrastructure/Persistence/EbookRepository.cs:12:1" "Open source"
    click flow_file_nexusreader_infrastructure_services_billingservice_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Services/BillingService.cs:1:1" "Open source"
    click flow_file_nexusreader_infrastructure_services_bookstorageservice_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Services/BookStorageService.cs:1:1" "Open source"
    click flow_type_nexusreader_infrastructure_services_bookstorageservice_cs_bookstorageservice_10 href "vscode://file/NexusReader.Infrastructure/Services/BookStorageService.cs:10:1" "Open source"
    click flow_file_nexusreader_infrastructure_services_epubreaderservice_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Services/EpubReaderService.cs:1:1" "Open source"
    click flow_file_nexusreader_infrastructure_services_knowledgeservice_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Services/KnowledgeService.cs:1:1" "Open source"
    click flow_file_nexusreader_infrastructure_helpers_contenthasher_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Helpers/ContentHasher.cs:1:1" "Open source"
    click flow_file_nexusreader_infrastructure_helpers_jsonrepairhelper_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Helpers/JsonRepairHelper.cs:1:1" "Open source"
    click flow_file_nexusreader_web_client_handlers_authenticationheaderhandler_cs_file_1 href "vscode://file/NexusReader.Web.Client/Handlers/AuthenticationHeaderHandler.cs:1:1" "Open source"
    click flow_type_nexusreader_web_client_handlers_authenticationheaderhandler_cs_authenticationheaderhandler_14 href "vscode://file/NexusReader.Web.Client/Handlers/AuthenticationHeaderHandler.cs:14:1" "Open source"
    click flow_file_nexusreader_web_client_program_cs_file_1 href "vscode://file/NexusReader.Web.Client/Program.cs:1:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61 href "vscode://file/NexusReader.Web.Client/Program.cs:61:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingembeddinggenerator_66 href "vscode://file/NexusReader.Web.Client/Program.cs:66:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingbookstorageservice_74 href "vscode://file/NexusReader.Web.Client/Program.cs:74:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingebookrepository_84 href "vscode://file/NexusReader.Web.Client/Program.cs:84:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingsyncbroadcaster_94 href "vscode://file/NexusReader.Web.Client/Program.cs:94:1" "Open source"
```

This shows file-level dependencies and models across Infrastructure and Web.Client, highlighting KnowledgeService, EpubReaderService, BookStorageService and BillingService. Clickable nodes reference source files for quick inspection.

=== DIAGRAM 2: Startup and Service Registration Flow (primary-runtime) ===
```mermaid
---
config:
  flowchart:
    defaultRenderer: "elk"
---
flowchart TD
    subgraph flow_1_nexusreader_web_client_program_cs["Program.cs"]
    end
    subgraph flow_0_nexusreader_web_program_cs["Program.cs"]
    end
    flow_file_nexusreader_web_client_program_cs_file_1["Program.cs"]
    flow_file_nexusreader_web_program_cs_file_1["Program.cs"]
    flow_method_nexusreader_web_client_program_cs_findauthorbynameasync_88["FindAuthorByNameAsync"]
    flow_method_nexusreader_web_client_program_cs_getservice_71["GetService"]
    flow_method_nexusreader_web_client_program_cs_program_top_level_startup_15["Program (top-level startup)"]
    flow_method_nexusreader_web_client_program_cs_run_wasm_host_59["Run WASM Host"]
    flow_action_nexusreader_web_client_program_cs_findauthorbynameasync_repository_read_88_88["Reads repository or persistence state"]
    flow_file_nexusreader_infrastructure_configuration_aisettings_cs_file_1["AiSettings"]
    flow_file_nexusreader_infrastructure_configuration_stripesettings_cs_file_1["StripeSettings"]
    flow_type_nexusreader_infrastructure_configuration_aisettings_cs_aisettings_3[/"AiSettings"/]
    flow_type_nexusreader_infrastructure_configuration_stripesettings_cs_stripesettings_3[/"StripeSettings"/]
    flow_type_nexusreader_web_client_program_cs_configured_httpclient_40[/"configured HttpClient"/]
    flow_type_nexusreader_web_client_program_cs_n_a_55[/"N/A"/]
    flow_type_nexusreader_web_client_program_cs_nexusauthenticationstateprovider_33[/"NexusAuthenticationStateProvider"/]
    flow_type_nexusreader_web_client_program_cs_throwingbookstorageservice_74[/"ThrowingBookStorageService"/]
    flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61[/"ThrowingDbContextFactory"/]
    flow_type_nexusreader_web_client_program_cs_throwingebookrepository_84[/"ThrowingEbookRepository"/]
    flow_type_nexusreader_web_client_program_cs_throwingembeddinggenerator_66[/"ThrowingEmbeddingGenerator"/]
    flow_type_nexusreader_web_client_program_cs_throwingsyncbroadcaster_94[/"ThrowingSyncBroadcaster"/]
    flow_type_nexusreader_web_client_program_cs_wasmepubreader_56[/"WasmEpubReader"/]
    flow_type_nexusreader_web_client_program_cs_wasmknowledgeservice_38[/"WasmKnowledgeService"/]
    flow_type_nexusreader_web_client_program_cs_webplatformservice_18[/"WebPlatformService"/]
    flow_action_nexusreader_web_client_program_cs_getservice_return_71_71(["returns null"])
    flow_file_nexusreader_web_client_program_cs_file_1 -->|unknown| flow_method_nexusreader_web_client_program_cs_run_wasm_host_59
    flow_file_nexusreader_web_client_program_cs_file_1 -->|uses| flow_type_nexusreader_web_client_program_cs_configured_httpclient_40
    flow_file_nexusreader_web_client_program_cs_file_1 -->|application services via extension| flow_type_nexusreader_web_client_program_cs_n_a_55
    flow_file_nexusreader_web_client_program_cs_file_1 -->|NexusAuthenticationStateProvider| flow_type_nexusreader_web_client_program_cs_nexusauthenticationstateprovider_33
    flow_file_nexusreader_web_client_program_cs_file_1 -->|IDbContextFactory AppDbContext>| flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_49
    flow_file_nexusreader_web_client_program_cs_file_1 -->|IEpubReader| flow_type_nexusreader_web_client_program_cs_wasmepubreader_56
    flow_file_nexusreader_web_client_program_cs_file_1 -->|IKnowledgeService| flow_type_nexusreader_web_client_program_cs_wasmknowledgeservice_38
    flow_file_nexusreader_web_client_program_cs_file_1 -->|IPlatformService| flow_type_nexusreader_web_client_program_cs_webplatformservice_18
    click flow_file_nexusreader_web_client_program_cs_file_1 href "vscode://file/NexusReader.Web.Client/Program.cs:1:1" "Open source"
    click flow_method_nexusreader_web_client_program_cs_program_top_level_startup_15 href "vscode://file/NexusReader.Web.Client/Program.cs:15:1" "Open source"
    click flow_method_nexusreader_web_client_program_cs_getservice_71 href "vscode://file/NexusReader.Web.Client/Program.cs:71:1" "Open source"
    click flow_action_nexusreader_web_client_program_cs_getservice_return_71_71 href "vscode://file/NexusReader.Web.Client/Program.cs:71:1" "Open source"
    click flow_method_nexusreader_web_client_program_cs_findauthorbynameasync_88 href "vscode://file/NexusReader.Web.Client/Program.cs:88:1" "Open source"
    click flow_action_nexusreader_web_client_program_cs_findauthorbynameasync_repository_read_88_88 href "vscode://file/NexusReader.Web.Client/Program.cs:88:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61 href "vscode://file/NexusReader.Web.Client/Program.cs:61:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingembeddinggenerator_66 href "vscode://file/NexusReader.Web.Client/Program.cs:66:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingbookstorageservice_74 href "vscode://file/NexusReader.Web.Client/Program.cs:74:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingebookrepository_84 href "vscode://file/NexusReader.Web.Client/Program.cs:84:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingsyncbroadcaster_94 href "vscode://file/NexusReader.Web.Client/Program.cs:94:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_webplatformservice_18 href "vscode://file/NexusReader.Web.Client/Program.cs:18:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_nexusauthenticationstateprovider_33 href "vscode://file/NexusReader.Web.Client/Program.cs:33:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_wasmknowledgeservice_38 href "vscode://file/NexusReader.Web.Client/Program.cs:38:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_configured_httpclient_40 href "vscode://file/NexusReader.Web.Client/Program.cs:40:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_49 href "vscode://file/NexusReader.Web.Client/Program.cs:49:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_n_a_55 href "vscode://file/NexusReader.Web.Client/Program.cs:55:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_wasmepubreader_56 href "vscode://file/NexusReader.Web.Client/Program.cs:56:1" "Open source"
    click flow_method_nexusreader_web_client_program_cs_run_wasm_host_59 href "vscode://file/NexusReader.Web.Client/Program.cs:59:1" "Open source"
    click flow_file_nexusreader_infrastructure_configuration_aisettings_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Configuration/AiSettings.cs:1:1" "Open source"
    click flow_type_nexusreader_infrastructure_configuration_aisettings_cs_aisettings_3 href "vscode://file/NexusReader.Infrastructure/Configuration/AiSettings.cs:3:1" "Open source"
    click flow_file_nexusreader_infrastructure_configuration_stripesettings_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Configuration/StripeSettings.cs:1:1" "Open source"
    click flow_type_nexusreader_infrastructure_configuration_stripesettings_cs_stripesettings_3 href "vscode://file/NexusReader.Infrastructure/Configuration/StripeSettings.cs:3:1" "Open source"
    click flow_file_nexusreader_web_program_cs_file_1 href "vscode://file/NexusReader.Web/Program.cs:1:1" "Open source"
```

This diagram emphasizes startup wiring: AiSettings/StripeSettings are loaded and WASM client services (WasmEpubReader, WasmKnowledgeService) are registered. It maps DI tokens (IEpubReader, IKnowledgeService, IPlatformService) to concrete platform implementations.

=== DIAGRAM 3: Program.cs Flow (primary-runtime) ===
```mermaid
---
config:
  flowchart:
    defaultRenderer: "elk"
---
flowchart TD
    subgraph flow_1_nexusreader_web_client_program_cs["Program.cs"]
    end
    subgraph flow_0_nexusreader_web_program_cs["Program.cs"]
    end
    flow_file_nexusreader_web_client_program_cs_file_1["Program.cs"]
    flow_file_nexusreader_web_program_cs_file_1["Program.cs"]
    flow_method_nexusreader_web_client_program_cs_findauthorbynameasync_88["FindAuthorByNameAsync"]
    flow_method_nexusreader_web_client_program_cs_getservice_71["GetService"]
    flow_method_nexusreader_web_client_program_cs_program_top_level_startup_15["Program (top-level startup)"]
    flow_method_nexusreader_web_client_program_cs_run_wasm_host_59["Run WASM Host"]
    flow_action_nexusreader_web_client_program_cs_findauthorbynameasync_repository_read_88_88["Reads repository or persistence state"]
    flow_file_nexusreader_infrastructure_configuration_aisettings_cs_file_1["AiSettings"]
    flow_file_nexusreader_infrastructure_configuration_stripesettings_cs_file_1["StripeSettings"]
    flow_type_nexusreader_infrastructure_configuration_aisettings_cs_aisettings_3[/"AiSettings"/]
    flow_type_nexusreader_infrastructure_configuration_stripesettings_cs_stripesettings_3[/"StripeSettings"/]
    flow_type_nexusreader_web_client_program_cs_configured_httpclient_40[/"configured HttpClient"/]
    flow_type_nexusreader_web_client_program_cs_n_a_55[/"N/A"/]
    flow_type_nexusreader_web_client_program_cs_nexusauthenticationstateprovider_33[/"NexusAuthenticationStateProvider"/]
    flow_type_nexusreader_web_client_program_cs_throwingbookstorageservice_74[/"ThrowingBookStorageService"/]
    flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61[/"ThrowingDbContextFactory"/]
    flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61[/"ThrowingDbContextFactory"/]
    flow_type_nexusreader_web_client_program_cs_throwingebookrepository_84[/"ThrowingEbookRepository"/]
    flow_type_nexusreader_web_client_program_cs_throwingembeddinggenerator_66[/"ThrowingEmbeddingGenerator"/]
    flow_type_nexusreader_web_client_program_cs_throwingsyncbroadcaster_94[/"ThrowingSyncBroadcaster"/]
    flow_type_nexusreader_web_client_program_cs_wasmepubreader_56[/"WasmEpubReader"/]
    flow_type_nexusreader_web_client_program_cs_wasmknowledgeservice_38[/"WasmKnowledgeService"/]
    flow_type_nexusreader_web_client_program_cs_webplatformservice_18[/"WebPlatformService"/]
    flow_action_nexusreader_web_client_program_cs_getservice_return_71_71(["returns null"])
    flow_file_nexusreader_infrastructure_configuration_aisettings_cs_file_1 -->|dto AiSettings| flow_type_nexusreader_infrastructure_configuration_aisettings_cs_aisettings_3
    flow_file_nexusreader_infrastructure_configuration_stripesettings_cs_file_1 -->|dto StripeSettings| flow_type_nexusreader_infrastructure_configuration_stripesettings_cs_stripesettings_3
    flow_file_nexusreader_web_client_program_cs_file_1 -->|FindAuthorByNameAsync| flow_method_nexusreader_web_client_program_cs_findauthorbynameasync_88
    flow_file_nexusreader_web_client_program_cs_file_1 -->|GetService| flow_method_nexusreader_web_client_program_cs_getservice_71
    flow_file_nexusreader_web_client_program_cs_file_1 -->|Program top-level startup| flow_method_nexusreader_web_client_program_cs_program_top_level_startup_15
    flow_file_nexusreader_web_client_program_cs_file_1 -->|unknown| flow_method_nexusreader_web_client_program_cs_run_wasm_host_59
    flow_file_nexusreader_web_client_program_cs_file_1 -->|uses| flow_type_nexusreader_web_client_program_cs_configured_httpclient_40
    flow_file_nexusreader_web_client_program_cs_file_1 -->|application services via extension| flow_type_nexusreader_web_client_program_cs_n_a_55
    flow_file_nexusreader_web_client_program_cs_file_1 -->|NexusAuthenticationStateProvider| flow_type_nexusreader_web_client_program_cs_nexusauthenticationstateprovider_33
    flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingBookStorageService| flow_type_nexusreader_web_client_program_cs_throwingbookstorageservice_74
    flow_file_nexusreader_web_client_program_cs_file_1 -->|IDbContextFactory AppDbContext>| flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_49
    flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingDbContextFactory| flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61
    flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingEbookRepository| flow_type_nexusreader_web_client_program_cs_throwingebookrepository_84
    flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingEmbeddingGenerator| flow_type_nexusreader_web_client_program_cs_throwingembeddinggenerator_66
    flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingSyncBroadcaster| flow_type_nexusreader_web_client_program_cs_throwingsyncbroadcaster_94
    flow_file_nexusreader_web_client_program_cs_file_1 -->|IEpubReader| flow_type_nexusreader_web_client_program_cs_wasmepubreader_56
    flow_file_nexusreader_web_client_program_cs_file_1 -->|IKnowledgeService| flow_type_nexusreader_web_client_program_cs_wasmknowledgeservice_38
    flow_file_nexusreader_web_client_program_cs_file_1 -->|IPlatformService| flow_type_nexusreader_web_client_program_cs_webplatformservice_18
    flow_method_nexusreader_web_client_program_cs_findauthorbynameasync_88 -->|Reads repository or persistence state| flow_action_nexusreader_web_client_program_cs_findauthorbynameasync_repository_read_88_88
    flow_method_nexusreader_web_client_program_cs_getservice_71 -->|returns null| flow_action_nexusreader_web_client_program_cs_getservice_return_71_71
    click flow_file_nexusreader_web_client_program_cs_file_1 href "vscode://file/NexusReader.Web.Client/Program.cs:1:1" "Open source"
    click flow_method_nexusreader_web_client_program_cs_program_top_level_startup_15 href "vscode://file/NexusReader.Web.Client/Program.cs:15:1" "Open source"
    click flow_method_nexusreader_web_client_program_cs_getservice_71 href "vscode://file/NexusReader.Web.Client/Program.cs:71:1" "Open source"
    click flow_action_nexusreader_web_client_program_cs_getservice_return_71_71 href "vscode://file/NexusReader.Web.Client/Program.cs:71:1" "Open source"
    click flow_method_nexusreader_web_client_program_cs_findauthorbynameasync_88 href "vscode://file/NexusReader.Web.Client/Program.cs:88:1" "Open source"
    click flow_action_nexusreader_web_client_program_cs_findauthorbynameasync_repository_read_88_88 href "vscode://file/NexusReader.Web.Client/Program.cs:88:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61 href "vscode://file/NexusReader.Web.Client/Program.cs:61:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingembeddinggenerator_66 href "vscode://file/NexusReader.Web.Client/Program.cs:66:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingbookstorageservice_74 href "vscode://file/NexusReader.Web.Client/Program.cs:74:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingebookrepository_84 href "vscode://file/NexusReader.Web.Client/Program.cs:84:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingsyncbroadcaster_94 href "vscode://file/NexusReader.Web.Client/Program.cs:94:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_webplatformservice_18 href "vscode://file/NexusReader.Web.Client/Program.cs:18:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_nexusauthenticationstateprovider_33 href "vscode://file/NexusReader.Web.Client/Program.cs:33:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_wasmknowledgeservice_38 href "vscode://file/NexusReader.Web.Client/Program.cs:38:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_configured_httpclient_40 href "vscode://file/NexusReader.Web.Client/Program.cs:40:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_49 href "vscode://file/NexusReader.Web.Client/Program.cs:49:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_n_a_55 href "vscode://file/NexusReader.Web.Client/Program.cs:55:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_wasmepubreader_56 href "vscode://file/NexusReader.Web.Client/Program.cs:56:1" "Open source"
    click flow_method_nexusreader_web_client_program_cs_run_wasm_host_59 href "vscode://file/NexusReader.Web.Client/Program.cs:59:1" "Open source"
    click flow_file_nexusreader_infrastructure_configuration_aisettings_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Configuration/AiSettings.cs:1:1" "Open source"
    click flow_type_nexusreader_infrastructure_configuration_aisettings_cs_aisettings_3 href "vscode://file/NexusReader.Infrastructure/Configuration/AiSettings.cs:3:1" "Open source"
    click flow_file_nexusreader_infrastructure_configuration_stripesettings_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Configuration/StripeSettings.cs:1:1" "Open source"
    click flow_type_nexusreader_infrastructure_configuration_stripesettings_cs_stripesettings_3 href "vscode://file/NexusReader.Infrastructure/Configuration/StripeSettings.cs:3:1" "Open source"
    click flow_file_nexusreader_web_program_cs_file_1 href "vscode://file/NexusReader.Web/Program.cs:1:1" "Open source"
```

This flow maps startup functions and method interactions (FindAuthorByNameAsync, GetService) to repository reads and DI results. It underlines where AiSettings/StripeSettings are consumed.

=== DIAGRAM 4: Program.cs Execution Control Flow (control-flow) ===
```mermaid
flowchart TD
    subgraph NexusReader_Web_Client_Program["Program"]
    end
    flow_file_nexusreader_web_client_program_cs_file_1["Program.cs"]
    flow_file_nexusreader_web_program_cs_file_1["Program.cs"]
    flow_method_nexusreader_web_client_program_cs_findauthorbynameasync_88["FindAuthorByNameAsync"]
    flow_method_nexusreader_web_client_program_cs_getservice_71["GetService"]
    flow_method_nexusreader_web_client_program_cs_program_top_level_startup_15["Program (top-level startup)"]
    flow_method_nexusreader_web_client_program_cs_run_wasm_host_59["Run WASM Host"]
    flow_action_nexusreader_web_client_program_cs_findauthorbynameasync_repository_read_88_88["Reads repository or persistence state"]
    flow_action_nexusreader_web_client_program_cs_getservice_return_71_71(["returns null"])
    flow_method_nexusreader_web_client_program_cs_findauthorbynameasync_88 -->|Reads repository or persistence state| flow_action_nexusreader_web_client_program_cs_findauthorbynameasync_repository_read_88_88
    flow_method_nexusreader_web_client_program_cs_getservice_71 -->|returns null| flow_action_nexusreader_web_client_program_cs_getservice_return_71_71
    click flow_file_nexusreader_web_client_program_cs_file_1 href "vscode://file/NexusReader.Web.Client/Program.cs:1:1" "Open source"
    click flow_method_nexusreader_web_client_program_cs_program_top_level_startup_15 href "vscode://file/NexusReader.Web.Client/Program.cs:15:1" "Open source"
    click flow_method_nexusreader_web_client_program_cs_getservice_71 href "vscode://file/NexusReader.Web.Client/Program.cs:71:1" "Open source"
    click flow_action_nexusreader_web_client_program_cs_getservice_return_71_71 href "vscode://file/NexusReader.Web.Client/Program.cs:71:1" "Open source"
    click flow_method_nexusreader_web_client_program_cs_findauthorbynameasync_88 href "vscode://file/NexusReader.Web.Client/Program.cs:88:1" "Open source"
    click flow_action_nexusreader_web_client_program_cs_findauthorbynameasync_repository_read_88_88 href "vscode://file/NexusReader.Web.Client/Program.cs:88:1" "Open source"
    click flow_method_nexusreader_web_client_program_cs_run_wasm_host_59 href "vscode://file/NexusReader.Web.Client/Program.cs:59:1" "Open source"
    click flow_file_nexusreader_web_program_cs_file_1 href "vscode://file/NexusReader.Web/Program.cs:1:1" "Open source"
```

Control-flow view highlights runtime branches and repository read points for tracing execution during startup and WASM host runs.

=== DIAGRAM 5: Program.cs Contracts and Entities (class-diagram) ===
```mermaid
classDiagram
    class flow_file_nexusreader_web_client_program_cs_file_1["Program.cs"]
    class flow_file_nexusreader_web_program_cs_file_1["Program.cs"]
    class flow_file_nexusreader_infrastructure_configuration_aisettings_cs_file_1["AiSettings"]
    class flow_file_nexusreader_infrastructure_configuration_stripesettings_cs_file_1["StripeSettings"]
    class flow_type_nexusreader_infrastructure_configuration_aisettings_cs_aisettings_3["AiSettings"]
    class flow_type_nexusreader_infrastructure_configuration_stripesettings_cs_stripesettings_3["StripeSettings"]
    class flow_type_nexusreader_web_client_program_cs_configured_httpclient_40["configured HttpClient"]
    class flow_type_nexusreader_web_client_program_cs_n_a_55["N/A"]
    class flow_type_nexusreader_web_client_program_cs_nexusauthenticationstateprovider_33["NexusAuthenticationStateProvider"]
    class flow_type_nexusreader_web_client_program_cs_throwingbookstorageservice_74["ThrowingBookStorageService"]
    class flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_49["ThrowingDbContextFactory"]
    class flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61["ThrowingDbContextFactory"]
    class flow_type_nexusreader_web_client_program_cs_throwingebookrepository_84["ThrowingEbookRepository"]
    class flow_type_nexusreader_web_client_program_cs_throwingembeddinggenerator_66["ThrowingEmbeddingGenerator"]
    class flow_type_nexusreader_web_client_program_cs_throwingsyncbroadcaster_94["ThrowingSyncBroadcaster"]
    class flow_type_nexusreader_web_client_program_cs_wasmepubreader_56["WasmEpubReader"]
    class flow_type_nexusreader_web_client_program_cs_wasmknowledgeservice_38["WasmKnowledgeService"]
    class flow_type_nexusreader_web_client_program_cs_webplatformservice_18["WebPlatformService"]
    class flow_type_nexusreader_web_program_cs_groundednessrequest_567["GroundednessRequest"]
    class flow_type_nexusreader_web_program_cs_knowledgerequest_566["KnowledgeRequest"]
    flow_file_nexusreader_infrastructure_configuration_aisettings_cs_file_1 --> flow_type_nexusreader_infrastructure_configuration_aisettings_cs_aisettings_3 : dto AiSettings
    flow_file_nexusreader_infrastructure_configuration_stripesettings_cs_file_1 --> flow_type_nexusreader_infrastructure_configuration_stripesettings_cs_stripesettings_3 : dto StripeSettings
    flow_file_nexusreader_web_client_program_cs_file_1 --> flow_type_nexusreader_web_client_program_cs_throwingbookstorageservice_74 : model ThrowingBookStorageService
    flow_file_nexusreader_web_client_program_cs_file_1 --> flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61 : model ThrowingDbContextFactory
    flow_file_nexusreader_web_client_program_cs_file_1 --> flow_type_nexusreader_web_client_program_cs_throwingebookrepository_84 : model ThrowingEbookRepository
    flow_file_nexusreader_web_client_program_cs_file_1 --> flow_type_nexusreader_web_client_program_cs_throwingembeddinggenerator_66 : model ThrowingEmbeddingGenerator
    flow_file_nexusreader_web_client_program_cs_file_1 --> flow_type_nexusreader_web_client_program_cs_throwingsyncbroadcaster_94 : model ThrowingSyncBroadcaster
    flow_file_nexusreader_web_program_cs_file_1 --> flow_type_nexusreader_web_program_cs_groundednessrequest_567 : dto GroundednessRequest
    flow_file_nexusreader_web_program_cs_file_1 --> flow_type_nexusreader_web_program_cs_knowledgerequest_566 : dto KnowledgeRequest
    click flow_file_nexusreader_web_client_program_cs_file_1 href "vscode://file/NexusReader.Web.Client/Program.cs:1:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61 href "vscode://file/NexusReader.Web.Client/Program.cs:61:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingembeddinggenerator_66 href "vscode://file/NexusReader.Web.Client/Program.cs:66:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingbookstorageservice_74 href "vscode://file/NexusReader.Web.Client/Program.cs:74:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingebookrepository_84 href "vscode://file/NexusReader.Web.Client/Program.cs:84:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingsyncbroadcaster_94 href "vscode://file/NexusReader.Web.Client/Program.cs:94:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_webplatformservice_18 href "vscode://file/NexusReader.Web.Client/Program.cs:18:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_nexusauthenticationstateprovider_33 href "vscode://file/NexusReader.Web.Client/Program.cs:33:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_wasmknowledgeservice_38 href "vscode://file/NexusReader.Web.Client/Program.cs:38:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_configured_httpclient_40 href "vscode://file/NexusReader.Web.Client/Program.cs:40:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_49 href "vscode://file/NexusReader.Web.Client/Program.cs:49:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_n_a_55 href "vscode://file/NexusReader.Web.Client/Program.cs:55:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_wasmepubreader_56 href "vscode://file/NexusReader.Web.Client/Program.cs:56:1" "Open source"
    click flow_file_nexusreader_infrastructure_configuration_aisettings_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Configuration/AiSettings.cs:1:1" "Open source"
    click flow_type_nexusreader_infrastructure_configuration_aisettings_cs_aisettings_3 href "vscode://file/NexusReader.Infrastructure/Configuration/AiSettings.cs:3:1" "Open source"
    click flow_file_nexusreader_infrastructure_configuration_stripesettings_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Configuration/StripeSettings.cs:1:1" "Open source"
    click flow_type_nexusreader_infrastructure_configuration_stripesettings_cs_stripesettings_3 href "vscode://file/NexusReader.Infrastructure/Configuration/StripeSettings.cs:3:1" "Open source"
    click flow_file_nexusreader_web_program_cs_file_1 href "vscode://file/NexusReader.Web/Program.cs:1:1" "Open source"
    click flow_type_nexusreader_web_program_cs_knowledgerequest_566 href "vscode://file/NexusReader.Web/Program.cs:566:1" "Open source"
    click flow_type_nexusreader_web_program_cs_groundednessrequest_567 href "vscode://file/NexusReader.Web/Program.cs:567:1" "Open source"
```

Class view shows DTOs (AiSettings, StripeSettings), client-side stubs and concrete Wasm implementations, clarifying contract-to-implementation mapping in startup.

=== DIAGRAM 6: Program.cs Layer View (dependency-map) ===
```mermaid
---
config:
  flowchart:
    defaultRenderer: "elk"
---
flowchart LR
    subgraph layer_frontend["frontend"]
        flow_file_nexusreader_web_client_program_cs_file_1["Program.cs"]
        flow_action_nexusreader_web_client_program_cs_findauthorbynameasync_repository_read_88_88["Reads repository or persistence state"]
        flow_type_nexusreader_web_client_program_cs_configured_httpclient_40[/"configured HttpClient"/]
        flow_type_nexusreader_web_client_program_cs_n_a_55[/"N/A"/]
        flow_type_nexusreader_web_client_program_cs_nexusauthenticationstateprovider_33[/"NexusAuthenticationStateProvider"/]
        flow_type_nexusreader_web_client_program_cs_throwingbookstorageservice_74[/"ThrowingBookStorageService"/]
        flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_49[/"ThrowingDbContextFactory"/]
        flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61[/"ThrowingDbContextFactory"/]
        flow_type_nexusreader_web_client_program_cs_throwingebookrepository_84[/"ThrowingEbookRepository"/]
        flow_type_nexusreader_web_client_program_cs_throwingembeddinggenerator_66[/"ThrowingEmbeddingGenerator"/]
        flow_type_nexusreader_web_client_program_cs_throwingsyncbroadcaster_94[/"ThrowingSyncBroadcaster"/]
        flow_type_nexusreader_web_client_program_cs_wasmepubreader_56[/"WasmEpubReader"/]
        flow_type_nexusreader_web_client_program_cs_wasmknowledgeservice_38[/"WasmKnowledgeService"/]
        flow_type_nexusreader_web_client_program_cs_webplatformservice_18[/"WebPlatformService"/]
        flow_action_nexusreader_web_client_program_cs_getservice_return_71_71(["returns null"])
        flow_file_nexusreader_web_client_program_cs_file_1 -->|uses| flow_type_nexusreader_web_client_program_cs_configured_httpclient_40
        flow_file_nexusreader_web_client_program_cs_file_1 -->|application services via extension| flow_type_nexusreader_web_client_program_cs_n_a_55
        flow_file_nexusreader_web_client_program_cs_file_1 -->|NexusAuthenticationStateProvider| flow_type_nexusreader_web_client_program_cs_nexusauthenticationstateprovider_33
        flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingBookStorageService| flow_type_nexusreader_web_client_program_cs_throwingbookstorageservice_74
        flow_file_nexusreader_web_client_program_cs_file_1 -->|IDbContextFactory AppDbContext>| flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_49
        flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingDbContextFactory| flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61
        flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingEbookRepository| flow_type_nexusreader_web_client_program_cs_throwingebookrepository_84
        flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingEmbeddingGenerator| flow_type_nexusreader_web_client_program_cs_throwingembeddinggenerator_66
        flow_file_nexusreader_web_client_program_cs_file_1 -->|model ThrowingSyncBroadcaster| flow_type_nexusreader_web_client_program_cs_throwingsyncbroadcaster_94
        flow_file_nexusreader_web_client_program_cs_file_1 -->|IEpubReader| flow_type_nexusreader_web_client_program_cs_wasmepubreader_56
        flow_file_nexusreader_web_client_program_cs_file_1 -->|IKnowledgeService| flow_type_nexusreader_web_client_program_cs_wasmknowledgeservice_38
        flow_file_nexusreader_web_client_program_cs_file_1 -->|IPlatformService| flow_type_nexusreader_web_client_program_cs_webplatformservice_18
    end
    subgraph layer_infrastructure["infrastructure"]
        flow_file_nexusreader_infrastructure_configuration_aisettings_cs_file_1["AiSettings"]
        flow_file_nexusreader_infrastructure_configuration_stripesettings_cs_file_1["StripeSettings"]
        flow_type_nexusreader_infrastructure_configuration_aisettings_cs_aisettings_3[/"AiSettings"/]
        flow_file_nexusreader_infrastructure_configuration_aisettings_cs_file_1 -->|dto AiSettings| flow_type_nexusreader_infrastructure_configuration_aisettings_cs_aisettings_3
    end
    subgraph layer_application["application"]
    end
    click flow_file_nexusreader_web_client_program_cs_file_1 href "vscode://file/NexusReader.Web.Client/Program.cs:1:1" "Open source"
    click flow_action_nexusreader_web_client_program_cs_getservice_return_71_71 href "vscode://file/NexusReader.Web.Client/Program.cs:71:1" "Open source"
    click flow_action_nexusreader_web_client_program_cs_findauthorbynameasync_repository_read_88_88 href "vscode://file/NexusReader.Web.Client/Program.cs:88:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_61 href "vscode://file/NexusReader.Web.Client/Program.cs:61:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingembeddinggenerator_66 href "vscode://file/NexusReader.Web.Client/Program.cs:66:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingbookstorageservice_74 href "vscode://file/NexusReader.Web.Client/Program.cs:74:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingebookrepository_84 href "vscode://file/NexusReader.Web.Client/Program.cs:84:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingsyncbroadcaster_94 href "vscode://file/NexusReader.Web.Client/Program.cs:94:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_webplatformservice_18 href "vscode://file/NexusReader.Web.Client/Program.cs:18:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_nexusauthenticationstateprovider_33 href "vscode://file/NexusReader.Web.Client/Program.cs:33:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_wasmknowledgeservice_38 href "vscode://file/NexusReader.Web.Client/Program.cs:38:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_configured_httpclient_40 href "vscode://file/NexusReader.Web.Client/Program.cs:40:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_throwingdbcontextfactory_49 href "vscode://file/NexusReader.Web.Client/Program.cs:49:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_n_a_55 href "vscode://file/NexusReader.Web.Client/Program.cs:55:1" "Open source"
    click flow_type_nexusreader_web_client_program_cs_wasmepubreader_56 href "vscode://file/NexusReader.Web.Client/Program.cs:56:1" "Open source"
    click flow_file_nexusreader_infrastructure_configuration_aisettings_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Configuration/AiSettings.cs:1:1" "Open source"
    click flow_type_nexusreader_infrastructure_configuration_aisettings_cs_aisettings_3 href "vscode://file/NexusReader.Infrastructure/Configuration/AiSettings.cs:3:1" "Open source"
    click flow_file_nexusreader_infrastructure_configuration_stripesettings_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Configuration/StripeSettings.cs:1:1" "Open source"
```

Layered diagram separates frontend WASM clients from infrastructure config; useful for seeing platform-specific implementations and where Ai/Stripe configs are loaded.

=== DIAGRAM 7: Method Flow Details (method-flow) ===
```mermaid
flowchart TD
    subgraph NexusReader_Infrastructure_Helpers_ContentHasher["ContentHasher"]
    end
    subgraph NexusReader_Infrastructure_Helpers_JsonRepairHelper["JsonRepairHelper"]
    end
    subgraph NexusReader_Infrastructure_RealTime_SyncHub["SyncHub"]
    end
    flow_file_nexusreader_infrastructure_helpers_contenthasher_cs_file_1["ContentHasher"]
    flow_file_nexusreader_infrastructure_helpers_jsonrepairhelper_cs_file_1["JsonRepairHelper"]
    flow_method_nexusreader_infrastructure_helpers_contenthasher_cs_computehash_9["ComputeHash"]
    flow_method_nexusreader_infrastructure_helpers_jsonrepairhelper_cs_repair_8["Repair"]
    flow_method_nexusreader_infrastructure_realtime_synchub_cs_onconnectedasync_28["OnConnectedAsync"]
    flow_method_nexusreader_infrastructure_realtime_synchub_cs_ondisconnectedasync_38["OnDisconnectedAsync"]
    flow_method_nexusreader_infrastructure_realtime_synchub_cs_synchub_14["SyncHub"]
    flow_method_nexusreader_infrastructure_realtime_synchub_cs_updateprogress_19["UpdateProgress"]
    flow_action_nexusreader_infrastructure_helpers_contenthasher_cs_computehash_branch_11_11{"Evaluates branch condition"}
    flow_action_nexusreader_infrastructure_helpers_jsonrepairhelper_cs_repair_guard_clause_10_10{"Guards early exit or rejection path"}
    flow_action_nexusreader_infrastructure_realtime_synchub_cs_onconnectedasync_repository_read_30_30["Reads repository or persistence state"]
    flow_action_nexusreader_infrastructure_realtime_synchub_cs_ondisconnectedasync_repository_read_40_40["Reads repository or persistence state"]
    flow_action_nexusreader_infrastructure_realtime_synchub_cs_updateprogress_repository_read_21_21["Reads repository or persistence state"]
    flow_action_nexusreader_infrastructure_services_knowledgeservice_cs_askquestionasync_repository_read_717_717["Reads repository or persistence state"]
    flow_action_nexusreader_infrastructure_services_knowledgeservice_cs_executeairequestandcacheasync_guard_clause_167_167{"Guards early exit or rejection path"}
    flow_action_nexusreader_infrastructure_services_knowledgeservice_cs_getknowledgeinternalasync_guard_clause_83_83{"Guards early exit or rejection path"}
    flow_action_nexusreader_web_program_cs_program_top_level_branch_237_237{"Evaluates branch condition"}
    flow_file_nexusreader_infrastructure_realtime_synchub_cs_file_1["SyncHub"]
    flow_action_nexusreader_infrastructure_services_knowledgeservice_cs_askquestionasync_repository_read_717_717 -->|JsonRepairHelper.Repair| flow_method_nexusreader_infrastructure_helpers_jsonrepairhelper_cs_repair_8
    flow_action_nexusreader_infrastructure_services_knowledgeservice_cs_executeairequestandcacheasync_guard_clause_167_167 -->|JsonRepairHelper.Repair| flow_method_nexusreader_infrastructure_helpers_jsonrepairhelper_cs_repair_8
    flow_action_nexusreader_infrastructure_services_knowledgeservice_cs_getknowledgeinternalasync_guard_clause_83_83 -->|ContentHasher.ComputeHash| flow_method_nexusreader_infrastructure_helpers_contenthasher_cs_computehash_9
    flow_action_nexusreader_web_program_cs_program_top_level_branch_237_237 -->|SyncHub| flow_method_nexusreader_infrastructure_realtime_synchub_cs_synchub_14
    flow_file_nexusreader_infrastructure_helpers_contenthasher_cs_file_1 -->|ComputeHash| flow_method_nexusreader_infrastructure_helpers_contenthasher_cs_computehash_9
    flow_file_nexusreader_infrastructure_helpers_jsonrepairhelper_cs_file_1 -->|Repair| flow_method_nexusreader_infrastructure_helpers_jsonrepairhelper_cs_repair_8
    flow_file_nexusreader_infrastructure_realtime_synchub_cs_file_1 -->|OnConnectedAsync| flow_method_nexusreader_infrastructure_realtime_synchub_cs_onconnectedasync_28
    flow_file_nexusreader_infrastructure_realtime_synchub_cs_file_1 -->|OnDisconnectedAsync| flow_method_nexusreader_infrastructure_realtime_synchub_cs_ondisconnectedasync_38
    flow_file_nexusreader_infrastructure_realtime_synchub_cs_file_1 -->|UpdateProgress| flow_method_nexusreader_infrastructure_realtime_synchub_cs_updateprogress_19
    flow_method_nexusreader_infrastructure_helpers_contenthasher_cs_computehash_9 -->|true / false| flow_action_nexusreader_infrastructure_helpers_contenthasher_cs_computehash_branch_11_11
    flow_method_nexusreader_infrastructure_helpers_jsonrepairhelper_cs_repair_8 -->|exit / continue| flow_action_nexusreader_infrastructure_helpers_jsonrepairhelper_cs_repair_guard_clause_10_10
    flow_method_nexusreader_infrastructure_realtime_synchub_cs_onconnectedasync_28 -->|Reads repository or persistence state| flow_action_nexusreader_infrastructure_realtime_synchub_cs_onconnectedasync_repository_read_30_30
    flow_method_nexusreader_infrastructure_realtime_synchub_cs_ondisconnectedasync_38 -->|Reads repository or persistence state| flow_action_nexusreader_infrastructure_realtime_synchub_cs_ondisconnectedasync_repository_read_40_40
    flow_method_nexusreader_infrastructure_realtime_synchub_cs_updateprogress_19 -->|Reads repository or persistence state| flow_action_nexusreader_infrastructure_realtime_synchub_cs_updateprogress_repository_read_21_21
    click flow_action_nexusreader_infrastructure_services_knowledgeservice_cs_getknowledgeinternalasync_guard_clause_83_83 href "vscode://file/NexusReader.Infrastructure/Services/KnowledgeService.cs:83:1" "Open source"
    click flow_file_nexusreader_infrastructure_helpers_contenthasher_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Helpers/ContentHasher.cs:1:1" "Open source"
    click flow_method_nexusreader_infrastructure_helpers_contenthasher_cs_computehash_9 href "vscode://file/NexusReader.Infrastructure/Helpers/ContentHasher.cs:9:1" "Open source"
    click flow_action_nexusreader_infrastructure_services_knowledgeservice_cs_executeairequestandcacheasync_guard_clause_167_167 href "vscode://file/NexusReader.Infrastructure/Services/KnowledgeService.cs:167:1" "Open source"
    click flow_file_nexusreader_infrastructure_helpers_jsonrepairhelper_cs_file_1 href "vscode://file/NexusReader.Infrastructure/Helpers/JsonRepairHelper.cs:1:1" "Open source"
    click flow_method_nexusreader_infrastructure_helpers_jsonrepairhelper_cs_repair_8 href "vscode://file/NexusReader.Infrastructure/Helpers/JsonRepairHelper.cs:8:1" "Open source"
    click flow_action_nexusreader_infrastructure_services_knowledgeservice_cs_askquestionasync_repository_read_717_717 href "vscode://file/NexusReader.Infrastructure/Services/KnowledgeService.cs:717:1" "Open source"
    click flow_action_nexusreader_infrastructure_helpers_contenthasher_cs_computehash_branch_11_11 href "vscode://file/NexusReader.Infrastructure/Helpers/ContentHasher.cs:11:1" "Open source"
    click flow_action_nexusreader_infrastructure_helpers_jsonrepairhelper_cs_repair_guard_clause_10_10 href "vscode://file/NexusReader.Infrastructure/Helpers/JsonRepairHelper.cs:10:1" "Open source"
    click flow_action_nexusreader_web_program_cs_program_top_level_branch_237_237 href "vscode://file/NexusReader.Web/Program.cs:237:1" "Open source"
    click flow_file_nexusreader_infrastructure_realtime_synchub_cs_file_1 href "vscode://file/NexusReader.Infrastructure/RealTime/SyncHub.cs:1:1" "Open source"
    click flow_method_nexusreader_infrastructure_realtime_synchub_cs_synchub_14 href "vscode://file/NexusReader.Infrastructure/RealTime/SyncHub.cs:14:1" "Open source"
    click flow_method_nexusreader_infrastructure_realtime_synchub_cs_updateprogress_19 href "vscode://file/NexusReader.Infrastructure/RealTime/SyncHub.cs:19:1" "Open source"
    click flow_action_nexusreader_infrastructure_realtime_synchub_cs_updateprogress_repository_read_21_21 href "vscode://file/NexusReader.Infrastructure/RealTime/SyncHub.cs:21:1" "Open source"
    click flow_method_nexusreader_infrastructure_realtime_synchub_cs_onconnectedasync_28 href "vscode://file/NexusReader.Infrastructure/RealTime/SyncHub.cs:28:1" "Open source"
    flow_action

... (truncated from 56815 chars)
```

This connects KnowledgeService logic to helpers: ContentHasher computes hashes used to key KnowledgePacket caching, and JsonRepairHelper guards AI response parsing. It also shows repository reads and guard clauses; diagram output is truncated—see source files for full method flows.

### Key Files
- NexusReader.Infrastructure/Services/KnowledgeService.cs
- NexusReader.Infrastructure/Services/EpubReaderService.cs
- NexusReader.Infrastructure/Services/BookStorageService.cs
- NexusReader.Infrastructure/Services/BillingService.cs
- NexusReader.Infrastructure/Configuration/AiSettings.cs
- NexusReader.Infrastructure/Configuration/StripeSettings.cs
- NexusReader.Infrastructure/Helpers/ContentHasher.cs
- NexusReader.Infrastructure/Helpers/JsonRepairHelper.cs
- NexusReader.Infrastructure/Persistence/EbookRepository.cs
- NexusReader.Web.Client/Program.cs
- NexusReader.Web.Client/Handlers/AuthenticationHeaderHandler.cs

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</div>

---

## See Also

- [Data Layer, EF Core and Repositories](data-and-persistence.md)
- [Application Layer: Commands, Queries and DTOs](application-layer.md)
- [Security, Identity and Authorization](../flows/security-identity-auth.md)
- [Real-Time Sync, SignalR and Broadcast](../flows/realtime-and-sync.md)
- [Project Overview and Architecture](../collections/overview.md)
- [Business Overview](../business/business-overview.md)