Change in attributes and pk, and implement constraints (#19)

docs/README.md

@@ -243,57 +243,57 @@ await chain.invoke({
 ```mermaid
 erDiagram
     Repository {
-        string Url PK
-        string Owner
-        string Repo
-        string Language
-        string Descriptions
-        string DefaultRepo
-        int stars
-        int forks
+        string url PK
+        string owner
+        string repo
+        string language
+        string descriptions
+        string default_branch
+        integer stars
+        integer forks
     }
 
     Topics {
-        string Topic PK
+        string topic_name PK
     }
 
     RepositoryTopics {
-	    string RepositoryUrl FK "References Repository"
-	    string Topic FK "References Topics"
+	    string repository_url FK "References Repository"
+	    string topic_name FK "References Topics"
     }
 
     Branch {
-        string LastCommitSha PK
-        string Name PK
-        date Seen
-        string AiAnalysisSummary
-        string Url FK "References Repository"
+        integer branch_id PK
+        string last_commit_sha
+        string name
+        string repository_url FK "References Repository"
+        string commit_at
+        string created_at
+        string ai_summary
     }
 
     Folder {
-        int FolderId PK
-        string Name
-        string Path "Optional"
-        string ParentFolderId FK "References Folder"
-        string AiAnalysisSummary
-        string BranchSha FK "References Branch"
-        string BranchName FK "References Branch"
+        integer folder_id PK
+        string name
+        string path
+        integer parent_folder_id FK "References Folder"
+        string ai_summary
+        integer branch_id FK "References Branch"
     }
 
     File {
-		int FileID PK
-        string Name
-        string Sha
-        string Language
-        string Content
-        string AiAnalysisSummary
-        int FolderId FK "References Folder"
+		integer file_id PK
+        string name
+        string language
+        integer folder_id FK "References Folder"
+        string content
+        string ai_summary
     }
 
     Repository ||--o{ Branch : has
     Repository ||--o{ RepositoryTopics : has
     RepositoryTopics }o--|| Topics : references
     Branch ||--o{ Folder : contains
     Folder ||--o{ Folder : has_parent
-    Folder ||--|{ File : contain
+    Folder ||--|{ File : contains
 ```

src/db/migrations/create_tables.sql

@@ -1,55 +1,59 @@
-CREATE TABLE Repository (
-    url VARCHAR(255) PRIMARY KEY,
-    owner VARCHAR(50) NOT NULL,
-    repo VARCHAR(50) NOT NULL,
-    language VARCHAR(20) NOT NULL,
-    descriptions TEXT,
-    default_branch VARCHAR(50),
-    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+CREATE TABLE IF NOT EXISTS Repository (
+    url             VARCHAR(255) PRIMARY KEY,
+    owner           VARCHAR(50) NOT NULL,
+    repo            VARCHAR(50) NOT NULL,
+    language        VARCHAR(20) NOT NULL,
+    descriptions    TEXT,
+    default_branch  VARCHAR(50),
+    stars           INT,
+    forks           INT
 );
 
-CREATE TABLE Topics (
-    topic_name VARCHAR(50) PRIMARY KEY
+CREATE TABLE IF NOT EXISTS Topics (
+    topic_name      VARCHAR(50) PRIMARY KEY
 );
 
-CREATE TABLE RepositoryTopics (
-    repository_url VARCHAR(255),
-    topic_name VARCHAR(50),
+CREATE TABLE IF NOT EXISTS RepositoryTopics (
+    repository_url  VARCHAR(255),
+    topic_name      VARCHAR(50),
     PRIMARY KEY (repository_url, topic_name),
     FOREIGN KEY (repository_url) REFERENCES Repository(url),
     FOREIGN KEY (topic_name) REFERENCES Topics(topic_name)
 );
 
-
 /**
 Last Commit SHA length: https://stackoverflow.com/questions/18134627/how-much-of-a-git-sha-is-generally-considered-necessary-to-uniquely-identify-a
 */
-CREATE TABLE Branch (
-    last_commit_sha VARCHAR(40) NOT NULL PRIMARY KEY,
+CREATE TABLE IF NOT EXISTS Branch (
+    branch_id       SERIAL PRIMARY KEY,
+    last_commit_sha VARCHAR(40) NOT NULL,
     name            VARCHAR(50) NOT NULL,
     repository_url  VARCHAR(255),
     commit_at       TIMESTAMP,
-    CONSTRAINT fk_repository FOREIGN KEY (repository_url) REFERENCES Repository(url)
+    created_at      TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    ai_summary      TEXT,
+    FOREIGN KEY (repository_url) REFERENCES Repository(url),
+    CONSTRAINT unique_last_commit_per_repo UNIQUE (repository_url, last_commit_sha)
 );
 
-CREATE TABLE Folder (
-    folder_id SERIAL PRIMARY KEY,
-    name VARCHAR(30) NOT NULL,
-    path VARCHAR(100),
-    parent_folder_id SERIAL,
-    branch_sha VARCHAR(40) NOT NULL,
-    branch_name VARCHAR(50) NOT NULL,
+CREATE TABLE IF NOT EXISTS Folder (
+    folder_id           SERIAL PRIMARY KEY,
+    name                VARCHAR(30),
+    path                VARCHAR(100) NOT NULL,
+    parent_folder_id    INTEGER,
+    ai_summary          TEXT,
+    branch_id           INTEGER NOT NULL,
     FOREIGN KEY (parent_folder_id) REFERENCES Folder(folder_id),
-    FOREIGN KEY (branch_sha) REFERENCES Branch(last_commit_sha),
-    FOREIGN KEY (branch_name) REFERENCES Branch(name)
+    FOREIGN KEY (branch_id) REFERENCES Branch(branch_id),
+    CHECK ( (path = '' AND parent_folder_id IS NULL) OR (path != '' AND parent_folder_id IS NOT NULL) )
 );
 
-CREATE TABLE File (
-    file_id SERIAL PRIMARY KEY,
-    name VARCHAR(30) NOT NULL,
-    sha VARCHAR(40) NOT NULL,
-    language VARCHAR(20),
-    parent_folder_id SERIAL NOT NULL,
-    ai_summary TEXT,
-    FOREIGN KEY (parent_folder_id) REFERENCES Folder(folder_id)
+CREATE TABLE IF NOT EXISTS File (
+    file_id         SERIAL PRIMARY KEY,
+    name            VARCHAR(30) NOT NULL,
+    language        VARCHAR(20),
+    folder_id       INTEGER NOT NULL,
+    content         TEXT,
+    ai_summary      TEXT,
+    FOREIGN KEY (folder_id) REFERENCES Folder(folder_id)
 );