feat: add sidecar + processing migrations and postgres adapters

007_sidecar, 008_processing, 009_duplicate_groups migrations.
Tag, sidecar, job, batch, plugin, pipeline, duplicate repos.

crates/adapters/postgres/migrations/007_sidecar.sql

@@ -0,0 +1,8 @@
+CREATE TABLE sidecar_records (
+    asset_id             UUID PRIMARY KEY REFERENCES assets(asset_id),
+    sync_status          TEXT NOT NULL DEFAULT 'pending_write',
+    sidecar_storage_path TEXT NOT NULL,
+    last_synced_at       TIMESTAMPTZ,
+    last_known_file_hash TEXT,
+    error_message        TEXT
+);

crates/adapters/postgres/migrations/008_processing.sql

@@ -0,0 +1,42 @@
+CREATE TABLE jobs (
+    job_id          UUID PRIMARY KEY,
+    job_type        TEXT NOT NULL,
+    target_asset_id UUID,
+    batch_id        UUID,
+    status          TEXT NOT NULL DEFAULT 'queued',
+    priority        INTEGER NOT NULL DEFAULT 0,
+    payload         JSONB NOT NULL DEFAULT '{}',
+    result_data     JSONB,
+    retry_count     INTEGER NOT NULL DEFAULT 0,
+    max_retries     INTEGER NOT NULL DEFAULT 3,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    started_at      TIMESTAMPTZ,
+    completed_at    TIMESTAMPTZ,
+    error_message   TEXT
+);
+
+CREATE INDEX idx_jobs_status_priority ON jobs(status, priority DESC);
+CREATE INDEX idx_jobs_batch ON jobs(batch_id);
+
+CREATE TABLE job_batches (
+    batch_id        UUID PRIMARY KEY,
+    batch_type      TEXT NOT NULL,
+    total_jobs      INTEGER NOT NULL DEFAULT 0,
+    completed_count INTEGER NOT NULL DEFAULT 0,
+    failed_count    INTEGER NOT NULL DEFAULT 0,
+    status          TEXT NOT NULL DEFAULT 'in_progress'
+);
+
+CREATE TABLE plugins (
+    plugin_id     UUID PRIMARY KEY,
+    name          TEXT NOT NULL,
+    plugin_type   TEXT NOT NULL,
+    is_enabled    BOOLEAN NOT NULL DEFAULT true,
+    configuration JSONB NOT NULL DEFAULT '{}'
+);
+
+CREATE TABLE processing_pipelines (
+    pipeline_id   UUID PRIMARY KEY,
+    trigger_event TEXT NOT NULL,
+    steps         JSONB NOT NULL DEFAULT '[]'
+);

crates/adapters/postgres/migrations/009_duplicate_groups.sql

@@ -0,0 +1,6 @@
+CREATE TABLE duplicate_groups (
+    group_id         UUID PRIMARY KEY,
+    detection_method TEXT NOT NULL DEFAULT 'exact_hash',
+    status           TEXT NOT NULL DEFAULT 'unresolved',
+    candidates       JSONB NOT NULL DEFAULT '[]'
+);