feat: add multi-platform support for repositories and connections

- Rename github_accounts table to platform_connections and add platform-specific fields
- Add platform column to repos table with updated constraints and indexes
- Add platform column to analysis_jobs table with validation
- Backfill existing GitHub connections with user data
- Update RLS policies for renamed table

Author: devakone

supabase/migrations/0022_rename_github_accounts_to_platform_connections.sql

@@ -0,0 +1,61 @@
+-- Rename table
+ALTER TABLE github_accounts RENAME TO platform_connections;
+
+-- Add platform discriminator (existing rows are GitHub)
+ALTER TABLE platform_connections
+  ADD COLUMN platform TEXT NOT NULL DEFAULT 'github'
+  CHECK (platform IN ('github', 'gitlab', 'bitbucket'));
+
+-- Add platform-specific user info
+ALTER TABLE platform_connections
+  ADD COLUMN platform_user_id TEXT,
+  ADD COLUMN platform_username TEXT,
+  ADD COLUMN platform_email TEXT,
+  ADD COLUMN platform_avatar_url TEXT;
+
+-- Add token refresh support (GitLab/Bitbucket use refresh tokens)
+ALTER TABLE platform_connections
+  ADD COLUMN refresh_token_encrypted TEXT,
+  ADD COLUMN token_expires_at TIMESTAMPTZ;
+
+-- Add primary/disconnect tracking
+ALTER TABLE platform_connections
+  ADD COLUMN is_primary BOOLEAN NOT NULL DEFAULT false,
+  ADD COLUMN disconnected_at TIMESTAMPTZ;
+
+-- Make github_user_id nullable as it is specific to GitHub
+ALTER TABLE platform_connections ALTER COLUMN github_user_id DROP NOT NULL;
+
+-- Update unique constraints
+ALTER TABLE platform_connections
+  DROP CONSTRAINT IF EXISTS github_accounts_user_id_key;
+
+ALTER TABLE platform_connections
+  ADD CONSTRAINT platform_connections_user_platform_unique
+  UNIQUE (user_id, platform);
+
+ALTER TABLE platform_connections
+  ADD CONSTRAINT platform_connections_platform_user_unique
+  UNIQUE (platform, platform_user_id);
+
+-- Only one primary platform per user
+CREATE UNIQUE INDEX platform_connections_one_primary_idx
+  ON platform_connections (user_id)
+  WHERE is_primary = true AND disconnected_at IS NULL;
+
+-- RLS policies (update existing)
+DROP POLICY IF EXISTS "github_accounts_select_own" ON platform_connections;
+DROP POLICY IF EXISTS "github_accounts_insert_own" ON platform_connections;
+DROP POLICY IF EXISTS "github_accounts_update_own" ON platform_connections;
+
+CREATE POLICY "Users can view own platforms"
+  ON platform_connections FOR SELECT
+  USING (auth.uid() = user_id);
+
+CREATE POLICY "Users can insert own platforms"
+  ON platform_connections FOR INSERT
+  WITH CHECK (auth.uid() = user_id);
+
+CREATE POLICY "Users can update own platforms"
+  ON platform_connections FOR UPDATE
+  USING (auth.uid() = user_id);

supabase/migrations/0023_backfill_platform_connections.sql

@@ -0,0 +1,11 @@
+-- Backfill platform user info from users table
+UPDATE platform_connections pc
+SET
+  platform_user_id = u.github_id::text,
+  platform_username = u.github_username,
+  platform_email = u.email,
+  platform_avatar_url = u.avatar_url,
+  is_primary = true
+FROM users u
+WHERE pc.user_id = u.id
+  AND pc.platform = 'github';

supabase/migrations/0024_add_platform_to_repos.sql

@@ -0,0 +1,22 @@
+-- Add platform to repos (default github for existing)
+ALTER TABLE repos
+  ADD COLUMN platform TEXT NOT NULL DEFAULT 'github'
+  CHECK (platform IN ('github', 'gitlab', 'bitbucket'));
+
+-- Rename github_id for clarity
+ALTER TABLE repos RENAME COLUMN github_id TO platform_repo_id;
+
+-- Change platform_repo_id type to TEXT to support non-numeric IDs (Bitbucket)
+ALTER TABLE repos ALTER COLUMN platform_repo_id TYPE TEXT USING platform_repo_id::text;
+
+-- Add platform-specific fields
+ALTER TABLE repos ADD COLUMN platform_owner TEXT;
+ALTER TABLE repos ADD COLUMN platform_project_id TEXT;
+
+-- Index for platform queries
+CREATE INDEX repos_platform_idx ON repos(platform);
+
+-- Update unique constraint
+ALTER TABLE repos DROP CONSTRAINT IF EXISTS repos_github_id_key;
+ALTER TABLE repos ADD CONSTRAINT repos_platform_repo_unique
+  UNIQUE (platform, platform_repo_id);

supabase/migrations/0025_add_platform_to_analysis_jobs.sql

@@ -0,0 +1,3 @@
+ALTER TABLE analysis_jobs
+  ADD COLUMN platform TEXT NOT NULL DEFAULT 'github'
+  CHECK (platform IN ('github', 'gitlab', 'bitbucket'));